SEVENTEENTH ANNUAL EEPOKT. 



427 



more prominent dorso-lateral pointed projections, dorsal of anterior projections of 

 coxie 1, and one pair less prominent and more median, somewhat semilunar with con- 

 cavity median, surrounding the base of the neck. Two shallow cervical furrows, 

 extending more or less distinctly to posterior margin of body, may be interrupted in 

 the middle; a median furrow present in posterior half, may l^e indistinct; festoons of 

 posterior margin very indistinct. Distinct circular pores with extruding short, stout 

 bristly hairs scattered over entire surface. Eyes small, pale, at I intercoxal space. 

 Ventral surface lighter than dorsal, all portions provided with short, stout hairs. 

 ( Jenital pore broad, transverse, between cox?e II. Anus slightly posterior of stigmal 

 plane; anal plates (clypei) more chitinous than those of B. annulatus. Strong chiti- 

 nous cervical median caudal appendage present, 85 // long. Capitulum about 425 /< 

 long, postero-lateral spines of base more marked than in B. annulatus; mandibles 

 al)out 600 /I, digit about 90 /<; internal apophysis apparently with three teeth ; exter- 

 nal apophysis bidentate (only 3 specimens examined). Hypostome with four rows 

 of teeth on each half, the inner row may be less strongly developed than the others. 



Fig. 153. — Diagrams of mandibles: a, h, Eooj^hiius annulatus; c, B.clecoloratus; d, B. australis; 

 e, Rhipicephalus Evertsi. After Fuller, 1899, p. 391. a and e from Neumann. 



Palpi about 200 // long, in general similar to those of annulatus. Legs strong; coxae 

 similar to those of annulatus, but bidentation of I pair much more marked. Tarsi 

 similar to R. annulatus. 



Female. — Very similar to female of B. annulatus, but the lateral constriction at the 

 stigmata is usually more marked. Body elliptical, as broad in front as in back; 

 when replete, may attain 10 to 12 mm. long by 6 to 7 mm. broad. Color varies like 

 annulatus. Dorsal shield smaller, somewhat lighter in color. Eyes small, near mid- 

 dle or anterior third of lateral margin of scutum. Capitulum very short, 560 to 612 

 from postero-dorsal margin to anterior end of hypostome, quite similar to that of 

 annulatus except lateral projection slightly more marked. Mandibles 765 jli long, 

 digit 120// ; internal apophysis " tricuspid, and presenting a rounded process as well;" 

 external apophysis tridentate as in annulatus. Hypostome spatulate, slightly longer 

 than palpi, each half with four rows of 7 to 10 denticles which do not extend to the 

 base. Palpi very short, about 320 jn long, articles at least as broad as long, in general 

 similar to annulatus. Legs similar to annulatus. 



Hexapod larva. — Similar to R. annulatus; in some cases a third pair of stigmata 

 (between cox£e I and II) appears to be present. 



Historical review of Boophilus australis. 



The Australian and South American fever ticks were originally con- 

 sidered as identical with anniilatus. When the Australian com- 

 mission visited this Bureau, the writers of the present paper examined 

 the Australian forms and expressed the opinion that they wxre cer- 

 tainly a distinct variety and in all probability a distinct species. The 



