IXODES RICINUS LINNAEUS. 25 



metatarsus, tapering to tip, tarsus IV also slender and tapering; 

 coxa I with a long sharp spine at base and a minute one at tip, II 

 with a small tooth at tip behind, others practically unarmed. (See 

 PL II, fig. 10.) Abdomen above and below punctate and with many 

 hairs; in female before engorgement there is a submarginal groove, 

 incomplete behind; both ventral furrows divergent behind. Stigmal 

 plate (PI. II, fig. 13) rather large, circular, its surface minutely 

 granulate. 



Length of female shield, 1.1 nun. 



Specimens in Marx collection from Kansas on sheep and from 

 Texas on cattle. I have compared these with European specimens 

 and they seem to be identical. Possibly they were introduced into 

 this country with the hosts. I have not seen a male. Practically 

 all of the previous records of this species in this country apply to 

 Ixodes scajndans or to /. cookei. 



Ixodes scapularis Sa^^ (PL IX, figs. 1, 2.) 



Female. — Shield dark red-brown, almost black; legs and palpi 

 paler; abdomen brown. Capitulum (PL II, fig. 15; PL IX, fig. 2) 

 quite broad, hind angles acute, porose areas rather large, but plainly 

 smaller than in /. rieinvs; much broader than long and separated by 

 fully their length, their inner edge somewhat truncate, and their 

 outer angle not far from hind angle of capitulum ; palpi elongate, 

 second joint a little longer than the last, which is hardly twice as 

 long as broad. Shield (PL II, fig. 15) broad in front, plainly longer 

 than broad, broadly rounded behind, outer sides not angulate, and 

 no lateral carinte; punctuations fine and nmnerous all over surface. 

 Legs long and slender; tarsus I fully one and one-half times as long 

 as the metatarsus, and tapering to tip; tarsus IV plainly shorter 

 than I, tapering to tip (see PL II, fig. 15) ; trochanters I and II 

 swollen behind; all legs very hairy below; coxa I (PL IX, fig. 2) 

 with a long sharp spine behind at base, and a small apical tooth, 

 coxae II and III with apical tooth, IV unarmed (see PL II, fig. 14). 

 Abdomen finely striate, hairy, not prominently punctate; before en- 

 gorgement there is a submarginal groove each side; stigmal plate 

 (PL IX, fig. 2) circular, its surface finely and evenly granulate; 

 ventral furrows divergent behind. 



Length of female shield, 1.3 mm. 



Male. — Dark colored as in female ; the palpi are very short, second 

 and third joints no longer than broad; shield with subparallel sides, 

 densely punctate and very hair}'; legs and coxse as in the female; the 

 stigmal plate (PL II, fig. 15) large, and elongate. 



Length of male, 2 mm. 



From many places in the South, especially abundant in Florida 

 and southern Texas, where it occurs on dogs and man as well as on 



