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



6. Abdomen entirely black abbreviata 



Abdomen in part red arvensis 



7. Thorax clothed with cinereous pubescence; dorsal aspect of 



propodeum with oblique striae from a median raised line 



vulgaris 

 Thorax without cinereous pubescence; mesonotum strigose 

 or very closely punctate near sides urnaria 



S. (S.) abbreviata Fabricius. Howard, Insect Book, PI. 

 vii, Fig. 9. Recorded from the State, but without definite locality. 

 S. (S.) arvensis LePeletier. 

 S. (S.) extrematata Cresson. 



S. (S.) extrematata var. pictipennis Walsh. Howard, 

 Insect Book, PI. vii, Fig. 7. 



S. (S.) procera Klug. Howard, Insect Book, PI. v, Fig. 15. 



S. (S.) urnaria Klug. 



S. (S.) vulgaris Cresson. Howard, Insect Book, PI. vii, 

 Fig. 5- 



SCELIPHRONINI. 



The members of this tribe are easily recognized by the U- 

 shaped area on the dorsal aspect of the propodeum. They pro- 

 vision their nests, which are mud cells, with spiders. The species 

 are common and are commonly called " mud-daubers." 



Key to Genera. 



Petiole scarcely longer than propodeum, metallic blue or 

 violaceous Chalybion p. 682 



Petiole about twice length of propodeum, black and yellow, 

 not metallic Sceliphron p. 682 



Chalybion Dahlbom. 



C. caeruleum (Linnaeus). Blue Mud Wasp. Howard Insect 

 Book, PI. v, Fig. 22 (as genus Chlorion). 



This handsome, common species occurs throughout the State. 

 It uses the following three species of Epeira most frequently as 

 food for its young : E. strix, E. vulgaris, and E. juniperi. Berlin 

 Branford, and New Haven. 



Sceliphron Klug. 

 S. caementarius Drury. Mud-dauber. Howard, Insect 

 Book, PI. v, Fig. 14. 



