424 



BUREAU OF 4NIMAL INDUSTRY. 



Fig. 147.— Dorsal view 

 of claw I of hexapod 

 larva of same. Orig- 

 inal. 



base. Palpi very short {310 ju), subconical, articles at least as broad as long; first 

 article partially hidden under the an terc -dorsal border of the base of the capitulum; 

 second article pedunculate, dilated in a-salient crest in its middle portion, thus form- 

 ing a prominence inward (toward median line) and outward, and provided with 

 strong hairs, especially on the inner prominence; third article 

 smaller, subtriangular on its dorsal surface, where it forms a 

 projection in and out; fourth article small, cylindrico-conical, 

 inferoterminal. Legs rather thin, short (pair I, 2 mm.; pair II, 

 2.5 mm.), yellowish brown, first articles darker than the others. 

 Coxae: pair I subtriangular, posterior border bidentate or biun- 

 dulate, the division in many cases indistinct. Tarsi I unical- 

 carate, II to IV bicalcarate. Pulvillum about half as long as 

 claws. Stiff bristle-like hairs on all articles. 



Hexapod larva. — Body oval, slightly narrowed in front, about 

 600 ju long and 470 /.i broad, yellowish. Scutum thin, covering 

 more than half the back, scarcely emarginate for capitulum. 

 Short hairs on dorsal and ventral surfaces. Capitulum as broad 

 as long; base a rectangle transversely elongate on dorsal surface, 

 semicircular ventral surface. Mandibles 240 ju long, digit 32 jii, 

 of same type as in male. Hypostome rather spatulate, provided 

 on each half with two rows of five to seven teeth of nearly equal 

 size. Palpi with nearly cylindrical articles, without lateral 

 projections, provided with long hairs; fourth article relatively large, inserted on 

 median surface of third. Legs relatively strong; coxae somewhat similar to those of 

 male; tarsi without spurs. Stigmata small, circular, between coxae II and III, and 

 posterior of coxrs III; possibly also between coxae I and II. 



Habitat. — On cattle and deer; southern portion of United States of North America; 

 its southern limit is not established. Transcontinental quarantine 

 line is based upon this species, which is the transmitter of Texas fever. 



Historical review of Boophilus annulatus. 



In 1821 Say described a North American tick as follows: 



Body oval, pale reddish brown, tinged with sanguineous, particu- 

 larly behind, and with several longitudinal and oblique, black, abbre- 

 viated lines, scattered punctures, and three abbreviated, longitudinal 

 impressed lines behind; rostrum [= capitulum], with the ^aZpi dilated, 

 rather suddenly contracted at base, and annulated more prominently 

 beneath with about two elevated lines, which on the sides produce an 

 angulated appearance, much shorter than the haustellum [= man- 

 dibles + hypostome], rounded at tip; haustellum, the two superior 

 organs [= mandibles] emarginate at tip, exterior division dentate 

 beneath, inferior organ [— hypostome] with numerous resupinate 

 teeth [= denticles] resembling fenestrate punctures; posterior to the 

 origin of the palpi above is an orbicular, obscure assemblage of 

 punctures \_= porose area] resembling eyes; black dorsal lines of the . 

 male somewhat regular, consisting usually of a dorsal line divaricating before, and 

 behind, the middle, furnishing a branch each side, which at the tip of the abdomen 

 is confluent with a lateral line, which also branches off in two or three short lines 

 towards the feet; feet with a short, robust nail, and a reclivate pedunculated pul villus 

 and nails. 



Found in considerable numbers on a Cervus Virginianus, in east Florida. 

 It will be noticed that Say's specimens were taken in Florida from 

 the Virginia deer {Oervus virginianus — Cariacus americanm)^ hence 



Fig. 148.— Ven- 

 tral view of 

 same. Origi- 

 nal. 



