1880.] o 9 3 [Patton. 
Tachytes abdominalis. Larra abdominalis Say, West Quart. 
Rep., 11, 77, 2; Larrada abdominalis Cress., Tr. Am. Ent. Soc., 1 
379; Tachytes abdominalis Cress., Tr. Am. Ent. Soc., rv, 217. 
Tachytes caelebs Patton, Bull. U. 8. Geol. Surv., v, 355 ¢. 
Tachytes rufofasciata Cress., Tr. Am. Ent. Soc., rv, 217, 2. 
Tachytes fulviventris Cress., Proc. E. S. P., rv, 466, @. 
? 
TACHYTES CRASSUS nh. sp. 
?. Length 15-16mm. Robust; black; head, scape, thorax, femora 
and basal segment of the abdomen clothed with golden pubescence, the 
pubescence on collar and postscutellum somewhat silvery and that on 
disk of mesothorax and on metathorax and base of abdomen some- 
what griseous ; the pubescence more brilliant on the face and, in certain 
lights, upon the usual parts of the thorax; the ventral segments 
clothed with an appressed brown pubescence ; first, second and third 
dorsal segments with a narrow silvery margin, extending beneath 
upon the second and third segments ; dorsal area of the sixth segment 
black, clothed with appressed piceons bristles, the sixth segment 
mareined with shorter bristles. Middle of the mandibles, the labrum, 
the palpi, the knees, tibiae and tarsi, the tegulae and nervures, fer- 
ruginous; wings yellowish subhyaline, the apical margin paler. Body 
very finely punctured. Clypeus broadly and abruptly produced, the 
process glabrous, margined, the middle of the margin forming a broad 
rounded tooth or short lobe, the margin at each side having three 
crenulations or slight teeth. Labrum with a slight sinuation in the 
narrow anterior border, fringed with stout spinules. Tubercle of the 
ocelli clothed with silvery pubescence; the posterior ocelli much 
drawn out, extending downwards on the sides of the tubercle ; behind 
the ocelli a transverse arcuate or triangular depression from which an 
impressed line extends upon the vertex. Anterior portion of the 
mesonotum depressed in the middle, the lateral impressed lines being 
placed on the elevations at each side. Scutellum with a slight 
median impression, extreme base of the metathorax with two or three 
transverse grooves; metathorax subtruncate, its upper face with a 
distinct median impressed line, this line widening or forking pos- 
teriorly to enclose a smooth spot upon the verge of the truncation ; 
posterior face of the truncation medially impressed. Tarsi sparsely 
fringed with short spines, first joint of anterior tarsi with six spines 
exteriorly, the spines shorter than the third tarsal joint, the fourth 
joint of all the tarsi unarmed, the posterior tarsi with short spines at 
