PROCEEDINGS ENTOMOLOGICAL SOCIETY 



VISITORS OF Phaseolus lunatus. 



The following two species are common visitors of the lima 

 beans where they collect nectar: 



Bombus pennsylvanicus (De Geer) Franklin det. Crawford. 



Bombus fervidus Fabricius det. Crawford. 



The following three species of Megachile collect pollen and 

 are useful in cross fertilization. An especially important cross 

 pollinator in the locality studied is the female described below. 



Megachile exilis Cresson det. Cockerell. 



Megachile latimanus Say det. Cockerell. 



Megachile petulans Cresson. 



Female. Length about 11.5 mm. Black, the tarsi slightly reddish at 

 extreme apex, the flagellum with very obscure dark reddish spots on the 

 joints berfeath; hair of head and thorax black and white, the tuft behind 

 wings cream-color; ventral scopa pale yellow, becoming white basally, 

 black at extreme apex, but yellow on base of last segment; eyes dark (not 

 green) ; cheeks and vertex small; vertex with black hair, clypeus with some 

 black hair, front with black hair intermixed, face otherwise, and cheeks 

 with white hair; clypeus and supraclypeal area shining, but closely and 

 strongly punctured, no smooth median line on clypeus; lower edge of 

 clypeus gently concave, with a very small median tubercle, not projecting 

 below the margin; maxillary blades clear amber-color; first joint of labial 

 palpi 1200 n long, second, 975 p., tongue extending about 1360 n beyond 

 labial palpi; mesothorax and scutellum densely punctured, but moder- 

 ately shining between the punctures; discs of mesothorax and scutellum 

 with black hair, but thin white hair on mesothorax anteriorly, white hair 

 on scutellum posteriorly, and a band of dense white hair in scutello-meso- 

 thoracic suture; pleura covered with white hair; tegula? black; wings 

 dusky, especially apically; nervures dark; hair of legs mainly white, that 

 on inner side of tarsi ferruginous; short joints of anterior tarsi thickened; 

 middle and hind tarsi broadened, hind basitarsi very broad and flat; 

 abdomen broad cordiform, shining, very finely punctured, with very nar- 

 row entire white hair-bands on hind margins of segments, that on first 

 reduced to a fine ciliation except at sides; when the abdomen is seen from 

 above, onlj r a rather small amount of short black hair projects at sides: 

 sixth dorsal segment in lateral profile short and straight, with thin black 

 hair like that on fifth, though there is also a very delicate greyish prui- 

 nosity. Mandibles with two sharp teeth, a third truncate, and a long 

 inner edge. 



Habitat: East Falls Church, Virginia, at flowers of lima beans, 

 along with M. exilis Cresson, cf 1 , and A/, lat-itnanus Say, 9, 

 August 9 (S. A. Rohwer). It is readily distinguished from M. 

 rnfragilis Cresson by the 4-dentate mandibles (with the fourth 

 or inner tooth not at all salient, merely ;i stniight cutting edge'). 



