660 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



this species see Peckham, Bull. 2, Wisconsin Geol. and Nat. Hist. 

 Survey, 1898, pp. 73-76. See also Parker, Proc. Entomol. Soc. 

 Washington, 1915, vol. 17, p. 74. 



Occurs throughout the State. Has been taken in July and 

 August on flowers of milkweed. Many specimens from Branford, 

 Colebrook, New Haven, Poquonock, Prospect, Putnam, and 

 Scotland. 



Notoglossa Dahlbom. 



N. emarginata (Say). 



Squamae with a sharp curved point outside of the broad basal 

 part ; abdomen dull, finely, rather closely punctate. 



Occurs throughout the State and has been recorded from 

 Branford, Cheshire, East Hartford, New Haven, Poquonock, 

 Sachem's Head, Scotland, and West Haven, on flowers of milk- 

 weed and New Jersey tea. Flies from June to August. 



Crabronin^. 

 The wasps belonging to this group are seldom more than 15 

 mm. in length and range from this size to 3 mm. in length. All 

 of the species in the eastern United States are either black or 

 black and yellow. The small species are usually entirely black 

 while the large ones are black with yellow thoracic and abdominal 

 markings. These insects are easily recognized by the quadrate or 

 subquadrate heads, and by the venation, the important parts of 

 which are the truncate radial cell, the presence of the cubitus at 

 the base and the presence of only one cubital cell. The habits 

 of these insects are very varied. Some nest in stems, some in 

 galleries in wood and others in the soil. A few of the species 

 use spiders to provision their nests, while some use flies ; others 

 use bugs ; others, aphids ; others, moths ; and one is said to use 

 mites. It is a curious, but suggestive, circumstance that as far as 

 the evidence goes the different food and nesting habits are directly 

 associated with the specific groups pointed out by certain writers. 

 This problem may be more elucidated at some future time when 

 the habits of these wasps are more fully known and when the 

 generic groups are more thoroughly understood. In the mean- 

 time students who have the opportunity will be doing valuable 

 work in recording careful observations on the habits of any 

 species belonging to this family. 



