1915.] NATURAL SCIENCES OF PHILADELPHIA. 465 



T. tesselata, Century IV, No. 3, pp. 277, 278. 



The monotype only, a 9 , Labrador (Schneider). 



T. umbrosa, Century IV, No. 31, p. 292. 



The monotype only, a cf , Louisiana (Schaum). 



T. valida, Century IV, No. 21, pp. 287, 288. 



Eight specimens in the type-series; (1), 9 , No. 293, Illinois; 

 (2), cT, Virginia. The male sex is not mentioned in the original 

 description. The Massachusetts specimens have lost the locality- 

 labels. 



Lectotype, 9 , Illinois. 



T. versicolor, Century IV, No. 17, p. 285. 



The monotype only, a 9 , Illinois, bearing the label "versicolor m. " 



Part 2. Description of New or Little-known Species. 



Family TIPULID^. 



Sub-family TIPULIN^. 



Tribe Tipulini. 



NEPHROTOMA Meigen. 



Pales Meigen; Xouvelle Classification des Mouches, p. 14; 1800 (nomen 



nudem). 

 Nephroloma Meigen; Illiger's Magazine, p. 262: 1803. 

 Pachyrrhiiia Macquart; Histoire Xaturelle des Insectes; Dipteres I, p. 88; 



1834. 



The genus Nephrotoma was erected by Meigen in 1803 to include 

 the Fabrician species, dorsalis. The insect mentioned, specimens 

 of which are before me (Urdingen, Niederrhein, Germany; Riedel, 

 collector), is a typical Pachyrrhina of the same group as eucera Loew 

 (Nearctic). The venational details and the characters of the male 

 hypopygium are altogether of the nature of those occurring in Pachyr- 

 rhina. Loew, in a foot-note to the characterization of eucera {Ber- 

 liner Entomologische Zeitschrift, VH, Century 4, p. 297; 1863) states 

 that if Nephrotoma is to be separated from Pachyrrhina, eucera 

 should be referred to Nephrotoma. The antennae of eucera and dorsalis 

 are 19-segmented in the male; of polymera, 16-segmented in the 

 male; of the majority of the species of the genus, 13-segmented in 

 the male. Thus we see there is a very considerable range in the 

 number of antennal segments, but the species included are all so 

 very similar in the details of venation, in the male hypopygia and in 

 their general habitus and body-coloration that they should not be 

 separated, especially since the females show a very much lesser 

 range in the number of antennal segments (13 to 15). A considerable 



