964 



AN INTRODUCTION TO ENTOMOLOGY 



DD 



GG Transverse part of vein M distant from the stigma by two or 



more times the distance between the apex of cell 2d Ri + R2 



and the apex of the wing. Labrum exserted. p. 970. .Stizini 



FF. Abdomen with a cylindrical petiole which is composed only of 



the sternite. p. 967 Psenini 



Ocelli distorted, p. 971 Bembicini 



Subfamily LARRIN^ 



Tribe ASTATINI 



The members of this tribe are rather small, seldom more than 

 12 mm. in length. They are usually black or black and red. As in 

 the following tribe the anal lobe of the hind wings is large, the marginal 

 cell of the fore wings is appendiculate, and the abdomen is not petio- 

 late; but these wasps differ from the Larrini in that the ocelli are 

 normal and the middle tibiee are armed with two apical spurs. 



The habits of Astata unicolor and of Astata blcolor are described 

 by the Peckhams ('98) ; tnese species burrow in the ground and pro- 

 vision their nests with bugs. 



Tribe LARRINI 



Most members of the Larrini are of moderate size, but our species 

 range from 3 mm. to about 23 mm. in length. They are 

 usually rather stoutly built insects (Fig. 1196). The 

 anal lobe of the hind wings is long and scarcely sepa- 

 rated from the preanal lobe (Fig. 1197); the marginal 

 cell of the fore wings is appendiculate; the ocelli are 

 TacV^^fi~x distorted; and the middle tibiae are armed with one 

 terminatus. apical spur. 



Nearly all of the species burrow in sandy places 

 and provision their nests with orthopterous insects or with bugs ; but 



Fig. 1 197. — Wings of Tachysphex terminatus. 



Williams ('13) states that a few of the smaller species make their 

 nests in brambles. 



