No. 22.] HYMENOPTERA OF CONNECTICUT. 683 



At present all eastern specimens, composed of variously 

 marked forms, of the common black and yellow mud-dauber are 

 considered to belong to this species, although a number of varietal 

 names have been given. It occurs throughout the State. Bran- 

 ford, Colebrook, and New Haven. 



Larrin^. 

 The insects of this subfamily nest in the ground, and provision 

 their nests with Orthoptera. In the field they are active and 

 often difficult to net. They may be separated into two tribes as 

 follows : 



Key to Tribes. 



Posterior ocelli perfect; inner margins of eyes subparallel; 



pronotum trilobed dorsally lyrodini p. 683 



Posterior ocelli imperfect, flattened; inner margins of eyes 



strongly converging above; pronotum simple larrini p. 684 



LYRODINI. 



This tribe is represented in our region by only the typical 

 genus which may easily be recognized by the foregoing table. 



Lyroda Say. 

 There are but three species of this genus known from the 

 United States, and only two of these occur in the East, the third 

 being known from the unique type which was collected in 

 Colorado. The apical abdominal segments are clothed with pile. 

 The female is without a tarsal comb. 



Key to Species, 



Wings very dark fuscous; dorsal aspect of propodeum with- 

 out a longitudinal carina; clypeus of male not dentate 

 laterally, of female bidentate triloba 



Wings hyaline, apex dusky; dorsal aspect of propodeum with 

 a longitudinal carina; clypeus tridentate laterally subita 



L. triloba Say. 



This species, which is larger than the following, is easily 

 recognized. 



Branford, 20 August, 1905 (H. W. W.). 



L. subita Say. Howard, Insect Book, PI. vi, Fig. 5. 



This interesting, easily recognized little wasp feeds its young 

 from day to day with crickets of the genus Nemohius. The nest 



