1893.] NATURAL SCIENCES OF PHILADELPHIA. 469 



Pronotum not drawn under the dorsulum; metanotum shorter 

 than the dorsulum; anterior femora of $ emarginate near the 

 base as in Tachysphex and some species of Tachytes; pygidial 



area on apical portion with short, stiff hairs Ancistromma. 



15 — Comb on anterior tarsi ($) composed of stiff, tolerably short 

 thorns; pygidial area entirely covered with pubescence; hind 

 ocelli linear, hooked at upper end; fore femora of $ either 

 emarginate or not emargiuate near base Tachytes. 



Comb on anterior tarsi ( 9 ) composed of very long, flexible spines 

 or bristles; pygidial area naked; hind ocelli oval; fore femora 

 {$ ) always emarginate near the base Tachysphex. 



PISONOPSIS Fox. 



Pisonopsis Fox, Psyche, Nov. 1893, p. 553. 



Form stout; sculpture coarse; head as broad or slightly broader 

 than the thorax, in the $ it is distinctly broader ; mandibles distinctly 

 cut out on outer margin ; eyes reaching to the base of mandibles, 

 their inner margins converging a little towards the vertex and rather 

 strongly emarginate at about the middle, in the $ they are but 

 slightly emarginate ; ocelli round, regular and distinct, placed in a 

 triangle ; antennae ample, placed immediately behind the clypeus ; 

 shoulder tubercles not reaching to the tegulse ; metathorax a little 

 shorter than the dorsulum ; marginal cell long, but not reaching 

 beyond the tip of third submarginal, obtuse at tip, without appendic- 

 ulation ; three submarginal cells, the first more than twice longer 

 than the other two combined, the second petiolated, generally though 

 not always, receiving both recurrent nervures, third submarginal 

 narrow, wider below than at the top ; discoidal vein confluent with 

 the iuterno-medial vein ; stigma short, truncate at tip ; legs very 

 feebly armed, the anterior tarsi without comb, middle tibiae with a 

 single strong spur at apex, tarsal claws entire ; last dorsal segment of 

 the 9 with a distinct pygidial area, in the S the last ventral segment 

 roundly emarginate at apex. 



This genus is distinguished from Pison by the emarginate mandi- 

 bles, the last dorsal segment of 9 with a pygidial area, by its more 

 robust form and its coarse sculpture. From the other Larrid genera, 

 that have the eyes emarginate i. e. Aulacophilus and Trypoxylon, 

 the form of the abdomen will at once separate it. The male has the 

 flagellum deutated, but this may be only a specific difference. 



Pisonopsis clypeata Fox. 

 P. clypeata Fox, Psyche, Nov. 1893, p, 553. ? $ . 



9 . — Clypeus convex medially, with large, scattered punctures, 



