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



Exochus Gravenhorst. 

 Key to Species. 



1. Hind tibiae without a pale annulus, but with at least the 



basal two-thirds whitish 2 



Hind tibiae black at base and apex, with a white annulus be- 

 tween; abdomen black, or dusky reddish at base 5 



2. Hind tibiae reddish to pale honey-yellow, or with at least 



the basal two-thirds whitish, but always with apex of same 

 dusky to black; thorax with a white stripe or triangular 

 spot in front of tegulae, scutel more or less pale, meso- 

 notum black; abdomen punctate above; first and second 



pleural areas of propodeum separated by a ridge 3 



Hind tibiae unicolorous , 4 



3. Abdomen black, or at least with only one or two segments 



narrowly pale at their apex. Length 5-7 mm. (female and 



male) pallipes 



Abdomen with lateral apical corners of second and third dor- 

 sal segments yellow. Length 5 mm. (male) 



pallipes var. pleuralis 



4. Abdomen black, or with apical margins of dorsal segments 



narrowly pale; second dorsal abdominal segment polished 

 or finely punctate; legs entirely reddish, without a pale 

 line in front of tegulae. Length 3.5-5 mm. (female and 



male) propinquus 



Abdomen mostly reddish, black at base, or black at base and 

 apex. Length 7-8 mm. (female and male) semirufus 



5. Mesopleurae, and usually most of the thorax, reddish. Length 



5.7 mm. (female and male) dorsalis 



Mesopleurae and rest of mesothorax not reddish; abdomen 

 black throughout; size the same as in the typical form 



dorsalis var. annulicrus 



*E. propinquus Cresson. 



E. semirufus Cresson. 



New Haven, 15 May, 1905 (B. H. W.), 24 May, 1905 (W. E. 

 B.) ; Mt. Carmel, 25 May, 1906, Southington, 16 May, 1906 (B. 

 H. W.). 



E. pallipes Cresson. 



New Haven, 22 May, 1905 (B. H. W.) ; Branford, 28 July, 

 1905 (H.L.V.). 



E. pallipes var. pleuralis Cresson. 



E. dorsalis Cresson. 



E. dorsalis var. annulicrus Walsh. 





