THE CANADIAN ENTOMOLOGIST. 231 



Melissodes trinodis, n. sp. 



Melissodes Pennsylvanica, Robertson, Trans. Scad. Sci., St. Louis, 7: 



355. 9 <*> l8 97- 



Besides the characters mentioned in the place cited, which 



distinguish this species from M. agilis, Cr., the maxillary palpi may be 



mentioned. Eighty-two per cent, of my specimens have the maxillary 



palpi three-jointed, while in the others the fourth joint is very minute. 



On the other hand, eighty-four per cent, of my specimens of M. agilis 



have the maxillary palpi four-jointed. 



This species has been identified as M. dentive/itris, Sm., and I have 



called it M. Pennsylvanica. Cresson thought his M. aurigenia might be 



the same as M. Pennsylvanica, Lep., which is quite as likely. 



Epeolus, Latr. 



The maxillary palpi are two-jointed, but with only one free joint, so 

 that it appears one-jointed. To this belong E. bifasciatus, Cr.; zonatus, 

 Sm.; compact us, Cr.; pusilius, Cr.; intcrruptus, Rob., and the following. 

 It is my opinion that these insects are inquilines of Colletes, as in the case 

 of the European E. variegata. 



Epeolus lectoides, n. sp. 



°. . — Closely resembles E. lectus, Cr., and may be the same, but it is 

 smaller, the mandibles, tubercles and tips of scutellar spines, ferruginous ; 

 tibial spurs ferruginous, not black ; abdomen not strongly punctured, 

 apex of segment 5 with a subtriangular, silvery cinereous patch ; last 

 ventral segment black. Length, 9 mm. 



Carlinville, Illinois ; 1 $ specimen. 



Triepeolus, n. g. 



The maxillary palpi three-jointed, with two evident free joints. To 

 this belong E. concavus, Cr. (type) ; remigatus, F.; nevadensis, Cr.; 

 lunatics, Say; donatus, Sm.; Cressonii, Rob.; helianthi, Rob.; pectoralis, 

 Rob. I think that these insects are inquilines of Melissodime, as Mr. 

 Ashmead has already observed in the case of E. donatus and Eutechnia 

 taurea. 

 Chelostomoides, n. g. 



This is proposed as a new genus for the reception of Mcgachile 

 rufi /nanus, Rob. It has the general characters of Megachile, apical joint 

 of maxillary palpi quite long, hairy ; in female the clypeal region is 

 excavated, the mandibles long, narrow, tridentate. 



