284: THE CANADIAN ENTOMOLOGIST. 



SYNOPSIS OF EPEOLIN^. 



BY CHARLES ROBERTSON, CARLINVILLE, ILLINOIS. 



Females. 



Segment 5 with a more or less evident bevelled or truncate space, false 

 pygidium, which is rather sparsely short, bristly and fuscous, 

 purplish or sericeous in certain lights ; ovipositor (applied here to 

 one of a pair of appendages often exserted one on each side of 

 the sting) setiform, fimbriate, apex with several curved divergent 

 spines ; mandibles simple ; maxillary palpi 3-jointed ; scutel 

 finely punctured, sub-bilobed ; segments 1-4 with apical fascite of 

 pale appressed pubescence Triepeolus. 



Segment 5 with a silvery lunule at apex ; ovipositor ligulate, bare or 

 pubescent, apex acute, its edges dentate ; at least the mandibles, 



tegulse and legs red i . 



I. Maxillary palpi 3-jointed; mandibles with an internal tooth; closely 

 punctured ; scutel sub-bilobed ; pleura and pectus with surface 

 nearly concealed by pubescence ; mesonotum bilineate ; border 

 of segment i interrupted on apical margin, 2 with fascia produced 

 laterally and interrupted medially, 3-4 with apical fasciae notched 

 in the middle, 5 with two lateral patches ; tubercles, labrum and 

 joints 1-3 partly red ; 8 mm.; minima in gn. nov., type Triepeolus 

 minifuus, Rob Argyroselenis. 



Maxillary palpi 2-jointed Epeolus. 



Males. 



Maxillary palpi 2-jointed Epeolus. 



Maxillary palpi 3-jointed i. 



I. Mandibles with an internal tooth; minima in Argyroselenis. 



Mandibles simple Triepeolus. 



Triepeolus, Robertson. 

 Females. 



Ventral segment 5 flattened, concave, strongly produced and bent 

 down at apex ; dorsal segment 5 with a semicircular sericeous 

 truncation ; black ; mesonotum anteriorly with a broad pale- 

 yellow band ; border of segment i broad, interrupted basally and 

 sometimes apically ; fasci:e continuous on 2-4, gradually or 



abruptly widening on sides of 2 ; 13-16 mm concavus. 



Ventral segment 5 simple ; dorsal segment 5 usually with lateral 

 patches i . 



