EHIPICEPHALUS TEXANUS N. SP. 35 



sum one and one-half times as long as broad, the shield still more 

 narrow, and with subparallel sides, leaving broad lateral and apical 

 margins, the latter with twelve impressed lines; the shield with a 

 definite lateral groove reaching back from the eyes, and behind are 

 seven festoons, without basal groove ; also two submedian impressions, 

 and three in the apical part, the median one the longest ; surface with 

 many subequal punctures. Legs rather long, the fourth pair thick- 

 ened, anterior tarsi (PL V, fig. 4) rather slender; coxse I (PL V, fig. 

 3) with two processes behind on the style of Dermacentor^ the inner 

 one much the thicker, other coxae unarmed. Each side of the anus 

 is an elongate triangular plate (PL V, fig. 3) ; the apex of the abdo- 

 men is somewhat pointed; the stigmal plate (PL V, fig. 1) is elon- 

 gate, barely tapering behind and the tip upcurved, its surface with 

 many small granules. 



Length of male, 2.7 mm. 



Female. — Red-brown; legs pale; no markings. Capitulum (PL 

 V, fig. 1) broad, lateral angles acute, hind angles distinct, but little 

 produced ; porose areas triangular, situated on posterior part of ca- 

 pitulum, and touching on basal inner angle; palpi short, apex sub- 

 acute. Shield (PL V, fig. 1) plainly longer than broad, broadly 

 rounded behind, eyes farther back than in most ticks, surface with 

 many large punctures, furrows separating the lateral lobes very dis- 

 tinct and reaching to the hind margin. Legs slender, all tarsi long, 

 coxa? I (PL V, fig. 3) armed with two spines as in the male, other 

 coxa? unarmed, but with transverse ridges. Stigmal plate (PL V, 

 fig. 3) not very much longer than broad, with a prominent dorsal 

 ])rolongation, its surface with many distinct granules. 



Length of female shield, 1.3 mm. 



Specimens have been taken at several places in Texas — San Anto- 

 nio, Victoria, Brownwood, Brownsville, Green Lake — and from 

 Albuquerque, N. Mex. It also occurs in Mexico. It has been taken 

 from dogs and horses. 



Genus MARGAROPUS Karsch. 



Venter without distinct curved groove behind anus, but no subme- 

 dian furrows. Capitulum angulate on sides; porose areas elliptic, 

 distant. Palpi short and broad, second and third joints with trans- 

 verse ridges. Shield without markings; ocelli present. Abdomen 

 showing more or less distinct festoons behind. Coxa I bidentate be- 

 hind, coxa IV of male slightly larger than the others. Four anal 

 plates in male. Stigmal plate subcircular. Coxse I more distant 

 from the rostrum than in most ticks. Tarsi II, III, and IV indis- 

 tinctly divided, the parts subequal in length ; and a distinct tooth-like 

 claw at tip. 



