Hiltonius pulchrus Chamberlin 1918

Hiltonius pulchrus Chamberlin
Hiltonius pulchrus Chamberlin, Proc. Biol. Soc. Washington, vol. 31, p. 166.
1918. Hiltonius conservatus Chamberlin, Proc. Acad. Nat. Sci. Philadelphia, vol. 99,
p. 53, figs. 61-63. 1947. New synonjrmy. Hiltonius palmaris Loomis, Journ. Washington Acad. Sci., vol. 43, p. 418, figs.
6-9. 1953. New synonymy. Hiltonius conservatus, Chamberlin and Hoffman, U. S. Nat. Mus. Bull., no. 212,
p. 164. 1958. Hiltonius palmaris, Chamberlin and Hoffman, ibid. Hiltonius pulchrus, Chamberlin and Hoffman, ibid.
Diagnosis. — Males are distinguished from all other species of the genus by the characters of the gonopods as given in the key. Females dififer in the characters of the cyphopods from all other species of the genus except mimus. I am unable to give any reliable character to separate females of these two species. Specimens of pulchrus usually differ from those of hebes (with which they are sympatric) in having shorter, less acute paranoia of the collum, in the shape of the lateral portion of the second segment, and in body preportions. In all of these characters, pulchrus and mimus closely resemble each other.
Description. — L of males 45-59 mm. (51.8), of females 49-70 mm. (59.5) ; W of males 5.5-6.6 mm. (6.0), of females 5.6-6.9 mm. (6.3) ; L/W of males 7.6-10.2 (8.7), of females 7.9-8.8 (8.4). Segments 46-49 (48.1).
Eyes per patch 27-37 (32.0). Clypeal setae 7-9 (8.3); labral setae 12-19; (15.7). Stipital setae of gnathochilarium 6-10 (6.9) per stipes.
Paranota of collum relatively short, their lateral ends very narrowly rounded, subacute but not as sharply so as in hebes; anterior emarginations of collum moderate. Second segment usually more produced at anterior ventrolateral corner than at posterior corner, thus differing from most common condition in hebes.
Legs not as short as in most other species of Hiltonius, usually almost reaching sides of body when held horizontally.
Anterior telopodites of gonopods not uncinate distally but rounded and sometimes with small knob corresponding to distal process in carpinus and mexicanus. Coxal endites slightly produced ventrad at mesoventral corners. Posterior telopo
dite subspatulate distally, the spatulate portion with serrate edges ; serrate cephaHc edge of spatulate portion continuous with serrate margin of large mesally directed flange of cephalic surface of telopodite; the flange variable in size and shape, its mesodistal corner sometimes sharp and tooth-like but never as long and narrow as that of mimus. A wide membranous groove curving across cephalic face of posterior telopodite and thus separating prominent prefemoral region from more distal tibiotarsal region, this groove typical of all California species of Hiltonius. Opening of seminal receptacle on mesal face of tibiotarsal portion of telopodite just distal to shoulder of prefemoral portion, this more proximal location typical of California species of Hiltonius as opposed to distal location of opening in carpinus and mexicanus. Cephalic face of coxae of posterior gonopods usually obsolete.
Cyphopod with relatively short distal lobe, this usually curved caudad distally. Lateral suture with a long distal section running diagonally across lateral face of cyphopod in an impressed groove.
Distribution. — Known only from the southern portion of California.
Type. — Male (MCZ). Locality: Claremont, California. Type of conservatus: male (ANSP). Locality: Ft. Tejon, California. Type oi palmaris: male (USNM). Locality: Palm Canyon, Palm Springs, California.
Specimens Examined. — 10 (6 males, 4 females).
California. — Kern County: Ft. Tejon (male, holotype of conservatus) (ANSP). Los Angeles County: Claremont (2 males, one the holotype of pulchrus), W. A. Hilton (MCZ) ; Los Angeles (1 male, 1 female) (USNM) ; San Francisquito Canyon, 1953 (1 female) (LACM). Riverside County: Palm Canyon, Palm Springs, Dec. 4, 1919 (2 males, 1 female, holotype and paratypes of palmaris), H. F. Loomis (USNM). San Diego County: San Diego, Nov. 22, 1932 (1 male), McKeever (USNM).

Hiltonius pulchrus is a species of millipede in the family Spirobolidae, endemic to the United States. It occurs in California from Kern County to San Diego County.