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



Basal joints of antennae distinctly rounded out beneath; 

 apical joints normal 7 



7. Median anterior margin of clypeus produced into a lobe, 



which is strong but not tuberculate; dorsal aspect of pro- 



podeum distinctly sulcate breviventris 



Median anterior margin of clypeus not produced into a lobe 8 



8. Last tergite tufted laterally with dark hair; head and thorax 



with golden pubescence; third and fourth antennal joints 

 subequal; emargination of last sternite very narrow . .harpax 

 Last tergite not tufted laterally with black hair 9 



9. Hind tarsi not spinose; lateral teeth of clypeus large and dis- 



tinct mandibularis 



Hind tarsi distinctly spinose; third antennal joint not 

 shorter than second; abdomen black; longer spur of hind 

 tibiae longer than hind basitarsi calcaratus 



T. breviventris Cresson. 



Rockville, 23 August, 1905 (H. L. V.)- 



T. calcaratus Fox. 



New Haven, 23 August, 1906 (P. L. B.). 



°T. crassus Patton. 

 Probably confined tb the coast and river valleys of the State. 



T. harpax Patton. 



Recorded from the State without definite locality, but will 

 probably be found throughout the entire area. 



°T. mandibularis Patton. 

 Probably the same distribution as crassus. 



Tachysphex Kohl. 

 The species of the genus Tachysphex may be easily distin- 

 guished from the species belonging to the other genera which 

 occur in the region covered by this report, by the characters given 

 in the foregoing table. The species of this genus, like other 

 members of Larrini, are sand-loving wasps and may often be 

 found in abundance in some sandy place near a stream. In the 

 experience of the writer the species of Tachysphex visit flowers 

 less frequently than other members of the tribe Larrini. Only 

 one species has as yet been taken within the State, but a number 

 more will no doubt be found there when the Sphecoid fauna has 

 been carefully exploited. 



