1896.] NATURAL SCIENCES OF PHILADELPHIA. 89 



scattered hairs, a tuft of erect hairs behind the ocelli being most 

 noticeable, Clieeks with long white hairs. Face below antennae 

 semitransparent dull white, the clypeus prominent and shining. 

 The upper margin of the white is not very clearly defined, but it 

 ends abruptly in the median line at the lower level of the antennal 

 sockets, while at the sides of the face it ascends rather broadly not 

 quite the length of the scape above the level of the autennie. Thus 

 the pale color of the face is distributed as in obsctirata $ , except 

 that it perhaps ascends a little higher at the sides. (In bigelovice 

 and nitidella it ascends al)ove the level of the autennre in the median 

 line). Clypeus narrowly produced at sides to bases of mandibles, 

 but higher than in the Panama-hat type. Mandibles white with 

 rufous tips. Antennse pale testaceous ; flagellum, funicle and end 

 of scape becoming dark brown above. Lower half of cheeks nar- 

 rowly white along orbital margin, thus recalling the cheek-marking 

 of nitidella. 



Thorax with sparse but rather conspicuous hairs. Mesothorax 

 shining, appearing slightly bluish in some lights, very finely lineo- 

 lately sculptured, median groove distinct. Metathorax microscopic- 

 ally reticulate. Part of collar, and whole hind margin of prothorax, 

 connecting with tubercles, but very narrowly interrupted in median 

 line, white. The margin of the prothorax below the tubercles is 

 broadly white. Pleura hairy, dark except a white spot about as big 

 as a tubercle, anteriorly, Tegulfe hyaline. Wings hyaline ; costal 

 nervure, margin of stigma, and marginal nervure, sepia-brown, the 

 other nervures colorless. Marginal cell unusually long, poststig- 

 matal portion considerably the longest, minutely appendiculate. 

 (In nitidella and higelovice the marginal is conspicuously shorter.)' 

 Second submarginal narrowed more than one-half to marginal; 3d 

 discoidal very weak. 



Four anterior legs yellowish-white, tarsi becoming testaceous 

 middle tiliia? with a dark brown line behind. Hind legs with the 

 basal two-thirds of coxa^ above, most of distal half of femora above 

 and behind, and tibise except anterior margin, dark brown; the 

 tarsi brownish. 



Abdomen above with nearly equally broad bands of dull white 

 (becoming pale brownish toward tip) and dark sepia-brown ; these 

 bands not interrupted, nor united at sides or in the middle, nor 

 notched. First segment all brown-black except the hind margin 

 narrowly. The dark bands are four in number, the sixth segment 



7 



