I02 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



interrupted at middle, yellow; antennae, tegulae, upper 

 orbits at times, front femora, wings, veins, and stigma, 

 rufous. Male differs in having antennae black, front femora 

 entirely and middle femora beneath pale, and abdominal 

 segments two to four entirely yellow. Length 12 mm. 



dubius 



A. basilaris (Say). Howard, Insect Book, PL xiii, Fig. 15. 

 Connecticut (E. N.) ; New Haven (H. L. V.) ; Canaan (A. P. 

 Morse) ; Prospect, 15 August, 1906, Hamden, 23 August, 1910 

 (W. E. B.). 



A. dubius Norton. A. robustus Provancher. Scotland (B. 

 H. W.) ; Colebrook, 20 July, 1905 (W. E. B.) ; Lyme, 31 July, 

 1910 (A. B. C). 



CiMBICIN.E. 

 Key to Genera. 



1. Free part of 2d A present 2 



Free part of 2d A wanting, due to anastomosing of anal veins 



at middle Abia p. 102 



2. Basal plates deeply emarginate at apex and filled with a 



chitinous membrane; hind femora not toothed. .Cimbex p. 103 

 Basal plates not or scarcely emarginate at apex and never 

 with a chitinous membrane; hind femora more or less 

 distinctly toothed beneath Trichiosoma p. 103 



Abia Leach. 

 * A. inflata (Norton). Z area inflata Norton. Howard, Insect 

 Book, PL xii, Fig. 8 ; PI. xiii, Fig. 28. 



Basal plates white; body bluish black, with the legs beyond 

 the coxae except the basal two-thirds of the front and middle fe- 

 mora, and the basal plates, white; the posterior femora some- 

 times infuscated above; third and following abdominal seg- 

 ments with a band of sericeous pile, in no case covering the 

 entire segment. Length 11 mm. Larva feeds on honeysuckle. 

 Farmington (E. N.). 

 °A. americana (Cresson). Zarea americana Cresson. How- 

 ard, Insect Book, PI. xiv. Fig. 21. 



Basal plates not white; body greenish black, with the tro- 

 chanters, apices of the femora, the tibiae, and the tarsi, white; 

 third and following abdominal segments with a band of sericeous 

 pile covering practically the entire segment. Length 8-12 mm. 



