1896.] NATURAL SCIENCES OF PHILADELPHIA. 101 



♦ 



On Oct. 4th, at the same locality, Mr. C. Rhodes was so fortunate 

 as to find a $ on Verbesina encelioides. The glossa of the 9 shows 

 two brushes of hairs, separated by an interval ; that of the $ is 

 bare. 



The S is only about 4i mm. long ( $ 5i), and differs at once by 

 the abdomen, which is short and broad, black, with the margins of 

 the segments appearing broadly whitish because hyaline. The sides 

 of the first three segments show obscure whitish marks — all that is 

 left of the bands of the 9 . The venter resembles the upi^er surface. 

 The tip is rufous, produced, narrowly truncate. 



The face-markings, differently from most species, are as in the 9 . 

 The antennse are entirely brown-black. Cheeks unarmed. 



There is a singularly close resemblance between the $ of albovit- 

 tata and laticeps, so that the idea suggests itself that laticeps may be 

 a dimorphic large-headed $ of albovittata. But this could not be 

 taken as proven without positive evidence, or at least some analo- 

 gous case in the genus to guide us. Cresson has referred to a ^ 

 specimen of texana (megacephala) in which the head was unusually 

 large, but it may have been a different species. 

 66. Perdita vagans n. sp. 



$ . — Length 4-2 mm. Head and thorax shining, blue-black, with 

 sparse hairs which are quite long behind the ocelli. Head moder- 

 ately large, rather broader than long, cheeks unarmed, vertex shiny 

 though feebly microscopically granular ; clypeus panama-hat- 

 shaped, with the crown rather high. Cheeks wholly dark ; labrum 

 and mandibles pale yellowish. Clypeus pale yellow with the usual 

 black dots. Dog-ear and supraclypeal marks wanting, though the 

 former are represented by hardly noticeable pallid specks. Lateral 

 pale yellow face-marks subquadrate, nearly the shape of the main- 

 sail of a schooner, though shorter, the upper outer angle (of about 

 50°) about on a level with the antennal sockets. Antennae sepia- 

 brown above, yellowish beneath. Thorax smooth and shining. 

 Tubercles, and a couple of small spots on hind margin of prothorax 

 pale yellow. Pleura not very hairy. Tegulse hyaline. Wings 

 hyaline; stigma pale yellow, nervures colorless. Marginal cell 

 rather long, its poststigmatal portion a little the longest. Second 

 submarginal nearly triangular, narrowed more than half to mar- 

 ginal. Third discoidal absent. 



All the femora, and the hind tibite, black with the ends subtesta- 

 ceous yellowish. Anterior and middle tibi?e yellowish with a dark 

 patch behind. Tarsi all pale yellowish testaceous. 



