GEOLOGICAL SUKVEY OF THE TERRITORIES. 



733 



NIRMUS BUTEONI- 

 VORUS. 



bead, and short, broad Innate mesotlioracic segment, and long- oval forta 



of abdomen. 



Nirmus huteonivorus, n. sp. (Fig. 61.) 



A very large species, long and slender ; head long, oblong, snbtrape- 

 zoidal, half as wide in front as at base ; front truncate, with prominent 

 rounded lateral wings on each side of head, behind inser- 

 tion of autenuie, more prominent than usual. Antennte 

 just reach as far as the front edge of head ; four-jointed 5 

 two basal joints of much the same size and lengtli, two 

 outer much smaller, fourth slenderer, and a thinl longer 

 than third. A large, round inflated swelling on under 

 side, just behind the mouth, and behind the single-jointed 

 minute labial palpi, apparently forming a sucker to draw< 

 mouth near to skin of host. Mental region behind flat- 

 tened, rather narrow. Prothorax small, rounded square, 

 incised on each side ; a transverse impressed line crossing 

 the anterior third, and, with the longitudinal line, dividing 

 the surface into four square spaces, the two anterior half 

 as long as two posterior. Abdomen, including raeso and 

 metathorax, regularly ovallanceolate, two and a half times 

 as long as wide, with fine long hairs along edge. Legs 

 rather large and long, with tarsi on three hinder pair of legs, basal 

 joints much swollen and enlarged, with a white swollen disk-like under- 

 surface for holding on to skin of host ; second joint remarkably long and 

 slender. Edge of head white, and whole body black, front edge of head 

 white, hind edge black, a dark scutellate spot just behind the middle 

 of the head ; two round black spots under base of head ; two black 

 spots projecting inward at front edge of mesothorax ; a brown stripe 

 across hind edge of each abdominal segment, interrupted on anterior 

 four-rings by median line of the body. Joints of legs edged with black 

 brown. 



Specimens vary much in extent and intensity of dark lines and spots, 

 as usual. 



Length .40 inch. Twelve specimens. 



From Buteo Sicainsonii, (No. 231). ) Collected August 27, 1872, at Lower 

 Geyser Basin, Wyoming Territory. 



Differs remarkably in form and size from any figured bj^ Denny. 



I have in describing this species used, for comparison, a si)ecimeu 

 of this genus from Goose Lake, Siskiyou 

 Countj', Cal,, (J. Holleman,) in which the head 

 is triangular, and the tarsal joints not dilated, 

 and second joint is much shorter and thicker. 

 Its host not indicated. 



Docophorus syrnii, n. sp. (Fig. 62 ; a, an- 

 tenna; &, hind leg. 



Head a little longer than broad, being a 

 little longer than usual ; two-thirds as wide 

 as abdomen. ' Mouth cavity deeply excavated, 

 Trabecula3 smalj, acutely pointed, projecting 

 slightly beyond the head. Two oblique 

 chitinous bands diverge from base of head 

 to upper side of base of trabecuUiB; antenna' 

 slender, of the usual form; five-jointed:^ 

 fourth joint much shorter than fifth. Pro 

 thorax trapezoidal, half as wide as head ; me- 

 sothorax wide, projecting considerably beyond 

 the succeeding segment ; edge more*^ bulging . cocorHORus synku. 



Fig. 



