1916.1 NATURAL SCIENCES OF PHILADELPHIA. 505 



on June 18. Associated with this species were the following crane- 

 flies: Dicranomyia pubipennis, Limnobia indigena, Ldmnophila 

 niveitarsis, L. toxoneura, L. areolata, L. adusta, L. brevifurca, L. 

 rufibasis, L. munda, L. montana, L. lenta, L. emmelina, Ula elegans, 

 Rhaphidolabis (Rhaphidolabina) flaveola, Dolichopezu americana, 

 Tipiiln senega, T. hermannia, T. maerolaMs and T. valida. 



This interesting pallid species gave some trouble in assigning it 

 to this genus The general appearance of the fly is altogether t li.it 

 of Gonomyia, hut the presence of the radial cross-vein, the very 

 elongate subcosta and the position of the tuberculate pits make it 

 more probable that the present reference is the correct one. In its 

 venation it departs widely from that of the genotype, E. stigmatica 

 ( '-ten Sacken (Eastern Nearctic), in the oblique, Gonomyia-like course 

 of vein R 2 , in this respect suggesting certain of the European 

 Empedse. These insects with the oblique R 2 certainly appear 

 different from stigmatica, and if this difference were worthy of a name 

 it is this group that would have to be separated off from stigmatica, 

 the genus Empeda being erected for the species with the short cell R 2 

 and the normal, Erioptera-\ike course of vein R 2 . This Gonomyia- 

 Erioptera group of species gets more complex with the accession of 

 new forms, and it seems probable that the best basis for a division 

 is the position of the tuberculate pits, these being far cephalad in the 

 Gonomyia-like forms and retreated far backward and lying at nearly 

 mid-length of the sclerite in the genera and subgenera related to 



Erioptera. 



MOLOPHILUS Curtis. 



Molophilus Curtis; British Entomology, p. 444 (1833). 



Molophilus fultonensis sp. n. 



Much larger and darker colored than M. pubipennis to which it is 

 most closely related; antennae of the female much longer than in the 

 corresponding sex of pubipennis. 



Male. — Length, 3.5-4.4 mm.; wing, 5.6-6.4 mm. 



Female. — Length, 4.5-5 mm. ; wing, 5.3-6 mm. 



Very similar to the smaller M. pubipennis Osten Sacken, differing 

 as follows: much larger and darker colored, especially in the male 

 sex, the abdomen being dark brown instead of yellow; thorax without 

 the rich reddish tints of pubipennis; pronotum not bright yellow as in 

 pubipennis. Hypopygium with two chitinized hooks (Plate XXXI, 

 figs. 95, 96), the curved hook directed abruptly ventrad, ending in a 

 long slender point; the smaller straight one is more dorsad in position, 

 minutely denticulated along the ventral face; proximo-lateral angle 



