1918.] , 167 



middle ; 2nd abdominal segment rarely with distinct and numerous 

 punctures amidst the rugulosity, sometimes impunctate (antennae 

 with wider flagellar joints than in nana) . . .minutula, K. 



(^ parvula, summer gen.). 



7 (6). Clypeus with dense white hairs in fresh examples ; stigma generally 



yellow in the middle ; 2nd abdominal segment always with 

 niunerous punctures, though these are finer and more remote 

 in some examples of nana than in others. 



8 (9). First and second abdominal segments not entirely smooth between 



the piuictvu'es, but (more or less) finely rugulose ; antenna? longer, 

 with many of the flagellar joints evidently less wide ; genital 

 armature largely pale nana, K. 



9 (8). First and second abdominal segments very smooth and polished 



between the punctures over their whole surface ; antennae thick, 

 with many very short and transverse flagellar joints ; genital 



armature* nearly wholly dark sp. /3. 



10 (3). 2nd and 3rd abdominal segments along the apical depressed margins 

 very dull and densely sculptured spreta, Perez. 



? ?• 



1 (4). 2nd and 3rd abdominal segments with dense surface rugulosity, 



impunctate, or nearly so ; stigma generally brown or yellowish- 

 brown in the middle. 



2 (3). Mesonotum with moderately close puncturation, the punctures not 



extremely fine parvula + oninutula. 



(In the summer generation the anal fringe is generally 

 yellowish ; in the spring form generally to a large extent 

 fuscous.) 



3 (2). Mesonotum very dull, with very fine and more remote punctures 



(anal fringe always dark ; stigma dark) sp. a. 



4 (1). 2nd and 3rd abdominal segments with numerous shallow punctures 



amidst the rugulosity of the surface ; stigma generally pale or 

 yellow in the middle. 



5 (6). Apical margins of 1st and 2nd segments smooth and shining, at most 



with faint or obsolete sculpture nana. 



6 (5). Apical margins not polished, but with conspicuous surface-sculpture. 



7 (8). Sciitellum smooth, shining, finely and not very closely punctiu-ed; 



entire pubescent band of the 4th segment of the abdomen and the 

 broken ones of the I'nd and 3rd segments very conspicuous, formed 

 of dense white hairs spreta. 



8 (7). Scutellum closely and more strongly punctured, not polished; 



anterior area of propodeum very rugose all over (the rugosity not 

 becoming feebler posteriorly as in spreta), abdominal pubescent 

 bands not more developed than in nana s^. fi. 



* Only one example was examined in this respect, and the character may not be constant. 



