June, 1913] AlDRICH : NORTH AMERICAN SpECIES OF LiSPA. 146 



goniery Co., Pa.; Jackson, Miss. Dates, May i6 and 26, Aug. 11, 15 

 and 21, Sept., 11, Oct. 5 and 30. 



The three species, patcUata, tcntaculata, and sociahilis, form a 

 group in which the males are separated mainly but readily on second- 

 ary sexual characters, while the females offer almost no tangible 

 differences. The group has the tessellated pattern better developed 

 on the abdomen than in the rest of our species, and about equally in 

 both sexes. 



Lispa polita Coquillett. 



Coquillett, Invertebrata Pacifica, i, 34. — Ormsby Co., Nev. 



Harbeck, Entomological News, xx, 46, oc. in N. J. 



Male. — Wholly black, the only yellow ground color being in the palpi 

 and a band across the apex of the second joint of the antenna; head 2.62 

 times the width of front, the latter wide, rather golden along the orbits below ; 

 antenna ordinary ; face wide, sordid yellowish white, the sides with fine, 

 sparse hairs, coarser next the vibrissa ; palpi yellow, the basal part whitish, 

 widened gradually from the base, the widest part a little over half as wide as 

 the length of the third antennal joint, with a round, shining space thereon. 

 Thorax sub-shining, with a delicate brownish pruinosity, especially around 

 the humeri ; bristles strong, arranged as usual. Abdomen almost cylindrical, 

 shining black, with only the most delicate brown pruinosity ; fourth segment 

 one third as long as the third ; fifth segment hemispherical ; bristles rather 

 strong on the sides and near the apex. Femora all a little thickened, the hind 

 ones with two rows of rather short, strong bristles below; middle tibia with 

 a bristle on the front side below the middle and one on the hind side at the 

 middle; hind tibia 1.04 times as long as its tarsus, with one bristle on the 

 outer front side below the middle, and a strikingly long one opposite it in the 

 row on the hind side. Halteres dark yellow, calypters yellowish with 

 brownish-yellow margin. Wings rather infuscated, the base brownish. 

 Length, 7 mm. 



Female. — Head 2.33 times as wide as front; sides of face wider and with 

 more numerous hairs ; hind femur with only three or four bristles below ; 

 abdomen more oval, not so cylindrical, but very shining; femora hardly 

 thickened; calypters paler. Length 6.6 mm. 



Two males, Moscow, Idaho, Aug. 23, and Viola, Ida. (only 8 miles 

 from Moscow), Aug. 21; one female from the type lot, Ormsby Co., 

 Nevada, collected by C. F. Baker and lent me by C. W. Johnson. As 

 shown above, it has been reported from New Jersey. 



The structural characters of the species resemble those of uligi- 

 iiosa, 'but the shining black color is very distinctive. The abdomen of 

 the male is longer than that of the female, giving a greater total 

 length in the few cases examined. 



