Bobphilus Annulatus. Boophilus Bovis. 1 29 



four pairs of notches corresponding to the position of the legs. 

 Vulva small, central, between legs II. Anus between second 

 and last thirds of body. Two lateral sexual grooves. One me- 

 dian anal groove from the anus to .posterior margin of body. 

 Legs (8) slender, brown, with 6 segments, and each terminated 

 by two booklets and a sucker. Stiff hairs on all articles. Cu- 

 ticle of the body finely wrinkled and with short hairs. Head 

 (capitulum) very short. The mandibles, 860/i. with internal 

 apophy.sis bidentate, external apophysis tridentate. The dart 

 (hypostome) is flat, spatulate, with four rows of recurved hook- 

 lets. The /a^z are short (310JU.), articles (segments) as broad 

 as long, and numbers two and three bear the sharp, pointed, 

 lateral projections which characterize the boophilus. 



Male. Body oval, narrowed in front, broadest across stigmata. 

 Dorsal shield (scutum) reddish brown, covers entire dorsal sur- 

 face, prolonged in front by two pairs of projections, the outer the 

 most prominent, shows three grooves, two lateral and one pos- 

 terior central. Posterior border festooned, sometimes indistinctly. 

 Large, circular, bri.stle-bearing spores over the entire surface. 

 Ventral surface lighter colored, hairy, genital orifice central be- 

 tween legs II, anus in posterior third, just back of plane of stigmal 

 plates. Two pairs of anal plates (clypei) elongated anteriorly, 

 one pair near the anus, and one more laterally. No median 

 caudal appendix. Head (capitulum) similar to that of female, 

 somewhat smaller and straighter. Legs relatively larger, and 

 stronger. 



Fasting the mature female averages 6 mm., the male 3.5 mm. 

 Blood gorged the ovigerous female is about 9 mm. to 12 mm. 

 {yi inch). 



Hexapod larva. Body oval, narrowed in front 600/1 long, 

 470/i broad, yellowish. Scutum covering half the back, scarcely 

 notched for head anteriorly ; hairy ; stigmata small, round, be- 

 tween legs I and III, behind III and possibly between I and II. 

 Legs vefy large and strong relatively to the body ; tarsi without 

 spurs. 



Reproduction: Development. Dr. C. Curtice traced the 



life history of this parasite. The eggs laid by the ovigerous 



female hatch out hexapod larvae in three or four weeks in warm 



weather. After one week on a calf these larvae moult and form 



9 



