294 T. D. A. COCKER ELL. 



strongly :iii<l thickly imnctured; scutclhuii and post-scutellum mostly smooth; 

 metathorax rough ; pleurge and sides of luetatliorax with silvery hairs. Thorax 

 not so broad as head, and not very much greater in bulk. Abdomen hardly as 

 long as head and thorax, shining, but well punctured, suture between first and 

 second segments fairly eonstricted ; color black, with broad leraon-yellow bauds 

 on segments 1-5, that on 1 broadly interrupted in the middle, that on 2 narrowly 

 interrupted, the others continuous, those on 3 and 4 somewhat narrowed in the 

 middle ; venter with three interrupted bands, ('oxse black, with their tips more 

 or less yellow; femora black, with their distal tips yellow; tibiae yellow in front 

 and rufous behind on fore legs, middle tibia? yellow without and lemon within, 

 hind tibite yellow without and black within, but wholly yellow at their proximal, 

 and wholly black at their distal ends ; tarsi of anterior legs rufous, the others 

 piceous. Wings smoky hyaline, nervures piceous, stigma brown ; third submar- 

 ginal rapidly narrowing to marginal, a deep sinus between them ; marginal about 

 as long as first subiuarginal, narrowly obliquely truncate, with a small stump of 

 a nervure at its tip ; first subuiarginal somewhat longer than second and third 

 combined ; second small, nearly half narrowed the marginal, receiving the first 

 recurrent nervure a little beyond its middle ; third receiving the second recurrent 

 nervure much before its middle. 



Hab.—LnH Cruces, Ne,\v Mexico, June 8, 1894 (Ckll., 872). 

 The broad head and high-,set antennae have somewhat the aspect 

 of a bull's or buffalo's head, whence the specific name. 



The United States species of Ajjhitaidhops may be separated thus : 



A.— Face with three broad, yellow stripes frig-idus Smith. 



B. — Face without stripes. 



1. Legs red ; clypeus margined with yellow quadrinotatus Ashm. 



2. Legs black and yellow. 



a. Clypeus yellow laticinctus Cresson. 



b. Clypeus black taurulus Ckll. 



Cameron has described two species, A. margiiiipennis and A. punc- 

 tifrons Cam., from Mexico, but tliey both appear to me to belong to 

 Eiicerceru; the first mentioned being allied to E. caiiaUculatHS Say, 

 though evidently distinct. 



Nyssoii i^olstni n. sji. 9 . — Length about 6 mm., of anterior wing 4i mm. 

 Head and thorax black ; legs and abdomen except tip, rufous. Head seen from 

 above about twice as broad as long, about as broad as thorax ; seen from in front 

 transversely oval. Black, strongly rugose punctate, sparsely clothed with ap- 

 pressed white hairs, which, becoming dejiser, form a conspicuous silvery band on 

 the face bordering each eye, extending to the insertion of the antennae ; clypeus 

 black, with white hairs; mandibles rufous, with blackish tips. Antennse very 

 dark brown, first joint of flagellum longer than second. Thorax black, very 

 strongly rugoso-punctate ; anterior portion of prothorax, tegulfe and metathorax 

 rufous, but the last very dark; mesothorax with a faintly indicated median 

 groove; metathorax with a sharp spine on each side. Legs rufous, tarsi darker ; 

 fourth joint of hind tarsus conspicuously the shortest; spurs at apex of hind 

 tibia black, unequal, the one on the inner side being the longer ; hind tibia with 



