42 IXODOIDEA^ OR TICKS, OF THE UNITED STATES. 



separated; palpi slender, longer than width of the capitulum, mid- 

 dle joint about twice as long as last. Shield pentagonal, a little 

 broader than long, anterior sides slightly convex, posterior sides 

 straight, tip rounded; surface densely punctate; body with scattered 

 white hairs. Legs slender, tarsi (PI. YII, fig. '2) long, coxte armed 

 as in the male, except that the spine on coxa IV is barely larger than 

 that on coxse II and III. Stigmal plate (PI. VII, fig. 2) subtri- 

 angular, as broad behind as long, concave on upper outer edge, its 

 surface covered with minute granules. 



Length of female shield, 1.8 mm. 



Specimens come from various places in the South and Southwest, 

 It is abundant in southern Texas — San Antonio, Victoria, Browns- 

 ville, Uvalde, Rocks Resaca, Weets Ranch, Live Oak County, San 

 Tomas, etc. I have it also from Biscayne Bay, Florida ; Fort Bowie, 

 Ariz., and San Diego County, California. The species occurs also 

 in Mexico, Central America, the West Indies, and South America. 

 It infests a great variety of animals, but is not common on cattle or 

 horses. This species was described from Surinam, and later, by 

 Koch, from Brazil under several names. To this species also belongs, 

 I believe, the Ixodes crenatmn of Say, for none of our other species 

 so aptly fits his description. 



Genus DERMACENTOR Koch. 



Venter showing indistinctly a curved groove behind the anus, from 

 which a median line extends to margin of bod}^ Capitulum not 

 angiilate on sides; porose areas elliptic and transverse. Palpi short 

 and broad, the second joint barely longer than broad and with a basal 

 projection above, but not outw\ard. Shield usually marked with 

 white; ocelli present. Coxa I strongly biclentate behind; coxa IV 

 of male much larger than other coxse, and leg IV larger than other 

 legs. Abdomen shows festoons behind (except in distended female). 

 No anal plates to male. Stigmal plate large, usually reniform in 

 female, more elongate in nuile. Tarsi II, III, and IV indistinctly 

 divided, the parts subequal in length, and a minute tooth-like claw 

 at apex. 



Type. — D. reticvlatiis Fabricius. 



Tablk of the Species. 



1. Females 2 



Males 8 



2. Stigmal plate nearly circular, with from ten to twenty very large more 



or less isolated granulations ; shield without distinct punctures : color 



dark red-brown, without markings nitens. 



Stigmal plate with many much smaller, more crowded granulations; 

 shield distinctly punctured, and usually with some pale markings — 3 



