142 PROCEEDINGS OF THE ACADEMY OF 



Abdomen luteous, most of first and base of second and third segments 

 black; metatborax and pleura boney-ye.iow, the former Avith a 

 blackish stain at base 11. accuratus. 



Abdomen black on basal half; head, prothorax, and mesothorax black; 

 only the clypeus and mandibles white ; pleura and sides of meta- 

 tborax hone3''-yellow, the latter fuscous above ; posterior femora 

 black, their tibiae and tarsi bright yellow 12. furvus. 



Abdomen honey-yellow : 

 Metatborax with a central black stripe ; abdomen entirely pale honey- 

 yellow 18. univittatus. 



Metatborax entirely pale honey-yellow ; abdominal segments paler at 

 apex 14. pallidus. 



Abdomen and thorax vermilion-red ; basal margin of third and following 

 segments blackish ; head, except mouth, entirely black. 



15. atricepa. 



1. Polycyrtus melanoleucus. 



ATesostenus (Polyci/rhis) melanoleucus, Brulle, Hym., p. 204, %. 



9 Black; face, mouth, orbits broad on cheeks, broad annuliis 

 on antennae, collar, prominent upper margin of prothorax, two 

 short discal lines on mesothorax, a line on posterior margin before 

 scutellum, teguhe, spot on apex of scutelhnn and postscutellum, 

 from each side of which diverge a narrow line to base of wings, 

 pleura, except two or three black lines or spots, white ; metatbo- 

 rax white, a large cruciform mark on the disk, the transverse bar 

 very broad, a spot covering the spiracles and continued posteriorly 

 in a narrow line, a spot on each side above posterior coxre, and 

 the basal suture, black; legs yellow, coxre whitish, the two poste- 

 rior pair with a black stripe on outside, all the femora with a 

 black stripe above, the four anterior tibite above, their tarsi en- 

 tirely, and base of posterior tibioi fuscous ; wings hyaline, ner- 

 vures black ; abdomen above black, sides and apex of first seg- 

 ment, apex and a sublunate spot on each side of second, broad 

 apical and lateral margins of following segments, a transverse 

 line or spot on each extreme side of third segment, and the venter, 

 wliite. Smooth and shining ; frontal spine long and obtuse; au- 

 tenuiio as long as the body ; metathoracic spines long and sub- 

 acute ; areolet of anterior wing small, transverscl}' quadrate, 

 closed ; abdomen rather robust be3'ond first segment, which is 

 long and rather squarel}' dilated at apex. Length 6-G^ lines. 



%. Much more slender than ?, with longer antenna3 and legs; 

 the transverse l)arof the cross on metatborax is broader and sub- 

 triangular ; the legs have scared}' any tinge of j-ellowish ; the 



