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



Hypopygium in female simple, not developed into a process 

 with two prongs , 6 



4. Propodeum areolated 5 



Propodeum not areolated; second discoidal cell indistinct; 



clypeus, mouth, scape, pedicel, legs and abdomen almost 

 entirely stramineous; antennae K-jointed; head and thorax 

 mostly blackish. Length 1.75 mm. (female) exareolatus 



5. Second discoidal cell complete; petiole constricted at base 



and apex; first three antennal joints and legs stramineous; 

 abdomen mostly brownish, first and second sutures and 



apex yellowish rhagii 



Second discoidal cell incomplete or indistinctly defined; hind 

 and mid tibiae and femora dark brown, nearly black; first 

 three antennal joints and apex of abdomen stramineous 



aceris 



6. Legs and petiole stramineous or reddish; male antennae 15- 



or 16-jointed; female antennae 13-jointed salicaphis 



Legs and petiole black or blackish; male antennae 16- or 17- 

 jointed; female antennae 13- to 15-jointed, rarely 13-jointed 



rapse 



7. Legs usually pale, stramineous, at most brownish but never 



blackish or black 8 



Legs and body mostly black or blackish; stigma rather lance- 

 olate, not approximating an equilateral triangle in outline; 

 petiole without a smooth space, uniformly rugulose; face 

 beneath antennae and fore legs more or less stramineous 



nigripes 



8. Not almost entirely stramineous; head, mesonotum, and pro- 



podeum always black or blackish 9 



Almost entirely stramineous; head black, mesonotum, and 

 abdomen above sometimes infuscated; female antennae 17- 

 to 19-jointed; male antennae 19- to 23-jointed . . . . polygonaphis 



9. Female antennae 17- or less than 17-jointed; male antennae 



20- or less than 20-jointed 10 



Female antennae 17- to 20-jointed; male antennae 20- to 21- 

 jointed; face yellowish or brown rosae 



10. Female antennae 14- to 17-jointed; male antennae 17- to 20- 



jointed , 11 



Female antennae 14- to 15-jointed; male antennae 16- to 18- 

 jointed; blackish brown. Length 1.5 mm phorodontis 



11. Petiolarea nearly rectangular; second and third joints of 



maxillary palpi not more than twice as long as thick; 



hind coxae and femora stramineous avenaphis 



Petiolarea distinctly pentagonal; second and third joints of 

 maxillary palpi four times as long as thick ribis 



