No. 22.] HYMENOPTERA OF CONNECTICUT. 43 



16. Antennae with six segments; front wings with three anal 



veins fused into a singk vein Acordulecerin^ p. 165 



Antennae with three segments; front wings with three anal 

 veins never fused into a single vein • • . . 17 



17. Front wings with free part of Sci present Hylotomin^ p. 160 



Front wings with free part of Sci wanting Schizocerin-e p. 164 



DlPRIONIN^. 



Diprion Schrank. 



Lophyrus Latreille. 

 Antennas multiarticulate, with fifteen or more segments, 

 strongly serrate in the female and bipectinate in the male, the 

 rays shorter toward the apex; larvae infesting various species of 

 conifers. 



Key to Species. 



1. Antennae with sixteen segments, black; head, thorax, abdomen, 



and legs in great part luteous; wings hyaline. Females 



fabricii 

 Antennae with more than sixteen segments 2 



2. Head and thorax for the most part pale. Females 3 



Head and thorax for the most part black. Males 8 



3. Femora black or dusky at base; antennae with eighteen 



segments; antennae and scutellum pale yellow; mesonotum 

 with large black spots occupying the greater part of its 

 surface; head and thorax sparsely covered with deep punc- 

 tures abdominalis 



Femora wholly pale 4 



4. Tibiae waxen white, at least at base; antennas with seventeen 



segments 5 



Tibiae with no part waxen white; antennae usually with more 

 than seventeen segments 6 



5. Antennae luteous brown; tegulae, collar, and pleurae luteous 



brown; a line joining the ocelli, a stripe on each side lobe 

 of the mesothorax, and the sutures of the metathorax, 



black; claws with a tooth near the middle pinus-rigida 



Antennae black, with basal half of third segment pale; tegulae, 

 collar, and pleurae waxen white; sides of metathorax black; 

 claws with the tooth distinctly nearer the apex than the 

 middle abbotti 



6. Lateral lobes of mesonotum pale 7 



Lateral lobes of mesonotum and sutures metallic black; body 



yellowish brown; antennae with eighteen segments, black, 

 the third segment pale at base; claws with a short tooth 

 near the tip abietis 



