6S8 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Psenu\^s Kohl. 

 In America there are, as yet, no true Psenuli, but the genus is 

 represented by the subgenus Neofoxia Viereck, which differs 

 from true Psenulus in that the second cubital cell receives only 

 one recurrent vein or the second recurrent is interstitial with the 

 second transverse cubitus. 



°P. (Neofoxia*) trisculcus (Fox). 



This species may be found in the State. The pygidium is 

 broad and has large separate punctures. There is a tubercule 

 between the bases of the antennae. Black ; flagellum pale beneath. 



Psen Latreille. 

 Key to Subgenera. 



Second cubital cell receiving one recurrent vein, second re- 

 current received near base of third cubital cell; clypeus 

 with anterior margin depressed Psen (s. str.) p. 658 



Second cubital cell receiving both recurrent veins, or second 

 recurrent interstitial with second transverse cubitus; 



clypeus without a distinct depressed anterior margin 



Mimesa p. 658 



Subgenus Psen Latreille (s. str.). 



°P. (Psen) monticola (Packard). 

 Abdomen entirely red. Tibiae and tarsi testaceous. 



Subgenus Mimesa Shuckard. 

 Key to Species. 



1. Mesoscuto-scutellar suture foveolate; scutum coarsely punc- 



tate 2 



Mesoscuto-scutellar suture not foveolate; scutum nearly im- 

 punctate or with fine scattered punctures 4 



2. Petiole strongly trisulcate niger 



Petiole not trisulcate, flat above, and longer 3 



3. Tegulae brown; base of flagellum pale; scutum more coarsely 



sculptured; flagellum of male with joints rounded out 



beneath kohlii 



Tegulae and flagellum black; flagellum of male simple 



myersianus 



4. Petiole trisulcate; abdomen black nigrescens 



Petiole cylindrical; abdomen with some red 5 



* It has been recently shown that this group should be called Diodonius. See Rohwer, 

 1915. Proc. U. S. Nat. Mus.. vol. 49. p. 243. 



