34 Mr. T. D. A. Cockerell on 



G. sodalis, Cresson, though the lateral teeth of the scutellum, 

 while obtuse, are not short ; the apical margins of the wings 

 are only slightly dusky. The tibial spurs are black, and the 

 fifth abdominal segment has no lateral teeth, though there are 

 minute nodules. The lateral teeth of the sixth segment are 

 long. The upper apical teeth are flattened and rounded. 

 The spines on the anterior coxas are large and blunt. It is 

 to be remarked that while C. ribis was described from a 

 locality in the upper austral zone, it is also an inhabitant of 

 the boreal, and probably goes far north of New Mexico. On 

 June 29, 1902, my wife took females of G. ribis and 

 C. Porterce at flowers of Frasera at Beulah, New Mexico, in 

 the Canadian zone. 



The exact relationship of G. sodalis to ribis and Kincaidi 

 will not be determined until the male of the first-mentioned 

 is discovered. The localities given for sodalis are New York 

 and Colorado; New York, being first mentioned, may be 

 considered the type locality. I rather expect that ribis and 

 sodalis will prove to be one species. 



Epeolus, Latr. (sens. lat.). 



Females. 



Fifth ventral segment of abdomen 



strongly concave in lateral view ; fifth 



dorsal segment truncate ; size large.. 1. 

 Fifth ventral segment not so 2. 



1. Legs black. Triepeolus concavus (Cress.). 



Legs ferruginous Triepeolus penicilliferus 



2. Fifth dorsal segment with only a diffe- [(Brues). 



rentiated apical lunule; small species. 



{Epeolus.) 3. 



Fifth dorsal segment with a large diffe- 

 rentiated area ; large species. ( Tri- 

 epeolus.) 6. 



3. Front with a tubercle on each side ; 



scutellum red bifasciatus, Cress. 



Front simple ; scutellum black or 

 faintly reddish 4. 



4. First abdominal segment hairy all over ; 



antennae red, suffused with blackish ; 



tibial spurs clear red crucis, Ckll. 



First abdominal segment with a black 

 hairless area; antennae black, with 

 little, if any, red 5. 



5. Hind tibial spurs black ; two submar- 



ginal cells; antennas entirely black; 



lower half of pleura hairless Phileremus americanus, 



Hind tibial spurs clear red ; three sub- [Creeson, 



marginal cells; second and third 



