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



Key to Species. 



1. Head and thorax black 2 



Head and mesonotum pale or rufous lo 



2. Abdomen black 3 



Abdomen in great part reddish or yellowish 8 



3. Discoidal nervures entirely wanting 4 



Discoidal nervures more or less indicated by fuscous streaks 



califomicus 



4. Marginal cell much shorter than stigma 5 



Marginal cell large, as long as stigma flavipes 



5. Cauda short, not, or scarcely one-third, the length of abdo- 



men 7 



Cauda as long as abdomen clypeatus 



6. Metanotum above smooth, with three carinas 7 



Metanotum rugose above, with a single median keel 



carolinensis 



7. Coxae black or dusky above abruptus 



Coxae entirely pale obsoletus 



8. Metathorax with a median carina 9 



Metathorax without a distinct median carina caudatus 



9. Coxae black linellii 



Coxae pale melliventris 



ID. Metathorax coarsely rugose, with longitudinal raised lines 



caudatus 



Metathorax rugose but not longitudinally striated pallidus 



II. Metathorax twice as long as high longiceps 



Metathorax shorter quadriceps 



S. caudatus Say. 



Reddish testaceous. Metathorax black, and upper part of 

 mesothorax and sutures often blackened. Metathorax coarsely 

 rugose, with longitudinal raised lines, but without a distinct cen- 

 tral longitudinal carina. Cauda as long as the abdomen. Length 

 7-10 mm. 



Salisbury, 27, 30 August, 1904, Kent, 31 August, 1904 (W. 

 E. B.). 



°S. pallidus Say. 



Reddish testaceous. Metathorax more finely rugose than in 

 caudatus, and with a median carina. Cauda half the length 

 of the abdomen. Length 6-9 mm. 

 °S. linellii Ashmead. 



Black. Legs, except coxae, rufous, and abdomen rufous except 

 the last three segments. Hind tibial spur one-third the length of 

 the metatarsus. Length 4 mm. (male). 



