238 ENTOMOLOGICAL NEV/S. [Oct., '02 



Two 9 9 , IvUcaston, Camden Co., N. J., September 24, 1901 

 (E. Daecke). I consider this the autumnal type of A ?idrena 

 fulvipennis, easily recognized by the time of its occurrence, the 

 fuliginous wings, dark mandibles, legs and anal fimbria. A 9 , 

 Clementon, May 7, 1900 (Viereck), agrees well with Smith's 

 description and is probably a race, being darker generally than 

 the described type from Florida, 



Andrena salicis Robt. 



Process of tubercle triangular, polished, the apex sodose. Thorax 

 finely roughened. 



9. — Length 9 mm. Front striate, though not distinctly, vertex and 

 cheeks microscopically sculptured. Clypeus with coarse shallow punc- 

 tures, somewhat flat in the middle, without a median impunctate line. 

 Mandibles with a blunt tooth below the apex on the inner margin. Third 

 joint of antennae a little longer than joints four and five united. On the 

 apical half the flagellum is pale brownish beneath. Dorsulum dull finely 

 sculptured, with indistinct punctures. Scutellum swollen, slightly im- 

 pressed medially, rather shining. Metathorax finely sculptured, the en- 

 closure distinguished by being more strongly roughened than the sur- 

 rounding areas. Subcostal nervure brown, the other nervures and stigma 

 almost testaceous. First recurrent nervure received a little before the 

 middle of the second submarginal cell. Abdomen subopaque, micro- 

 scopically sculptured. Pygidium broad, dull. All pubescence uniformly 

 dull, ochreous, plentiful on head and thorax sparsest dorsally. Second, 

 third and fourth dorsal segments with a distinct apical fringe of closely 

 arranged ochreous hairs. Fimbria of two apical segments brownish. 

 Black. Tibial spurs whitish, apical tarsal joints and claws brownish. 



Philadelphia, Pa., April 15, 1897. Nine 9 9. One speci- 

 men is but 7.5 mm. in length. This appears to be one of the 

 earliest of Andrena for this vicinity. The tubercle has a very 

 narrowly truncated appearance, but it is doubtless A. salicis. 



Cheap Tropical American Butterflies. 

 By O. W. Bakkktt. 

 The low price at which many species of tropical " flies " can 

 be lx)Ught nowadays is a subject of wonder to many northern 

 collectors. Among the .several reasons fcr this apparent cheap- 

 ness the following are, I believe, the most practical. 



In the tropics where life-cycles are shorter, any disturbance 

 of the relations among the si)ecies of a locality is marked by 



