NORTH AMERICAN HYMENOPTERA. 315 



New IVorth American bees of the genera IIA1.I€TCS 

 and PROSOPIS. 



BY CHARLES ROBERTSON. 



The following descriptions are of species of bees which I have 

 taken on flowers in Illinois, and for which I need names. Through 

 the kindness of Mr. E. T. Cresson, I have had an opportunity to 

 examine the specimens of Halidus contained in the collection of the 

 American Entomological Society, so that the descriptions were made 

 from an examination of specimens from different parts of the country. 

 I have endeavored, as far as I was able, to describe the species so as 

 to be easily distinguished from nearly related species both described 

 and undescribed. The types will be found in the collection of the 

 American Entomological Society. 



Ilaljctus Forbesii 9 -—Black, clothed with dull yellowish pubescence; 

 head broader than high, clypeus not produced ; antenna} black ; mesothorax a 

 little shining, rather coarsely and closely punctured, scutellum sparsely punc- 

 tured ; metathorax not truncate, the semicircular disc bordered by a sharp edge 

 and bearing irregular radiating ruga), which reach the posterior margin ; abdo- 

 men finely punctured, segments 2-4 with a broad band of whitish pubescence at 

 base; wings hyaline, nervures dull honey-yellow; tegulae black, with a testa- 

 ceous dot; hindmost tibial spur long, with many short, mostly blunt teeth. 

 Length 8—9 mm. 



% .—More shining; face triangular, cheeks short, labnim with a median notch, 

 tips of closed mandibles hardly surpassing the clypeus, anterior half of clypeus 

 liale yellow, disc of metathorax with few radiating lines; wings with the ner- 

 vures darker than in 9, the teguls sometimes paler; all of the tarsi pale yel- 

 lowish white. Length 7 — 9 mm. 



Hah. — Illinois ; four 9 , two S specimens. Closely resembles 

 //. eoriaceus Sm. (= mbquacbvdm Sm. % ), but the metathorax is 

 rougher ; the 9 is distinguished by being a little more .shining, the 

 clypeus less produced ; the % by its more triangular face, shorter 

 mandibles and cheeks, and pale tarsi. Dedicated to Professor S. A. 

 Forbes. 



Halictus pectinatiis 9 .—Black, clothed with a thin whitish pubescence 

 oiypeus produced ; antenna) black ; mesothorax shining, finely and sparsely punc- 

 tured; metathorax with a poorly defined truncation, which slopes towards in- 

 sertion of abdomen ; disc small, rounded laterally and toward the truncation, a 

 little rough at base, smooth and shining beyond ; abdomen not fasciate, shining 

 and sparsely punctured on first segment, second segment densely punctured, 



