294 THE CANADIAN ENTOMOLOGIST. 



slightly pubescent ; posterior tarsi with first joint large, elevated, obliquely 

 truncate and emarginate at tip, more than twice as long as second 

 and much thicker, second joint longer than the third ; claws pectinate ; 

 anterior and median tibia? with the first joint longer than the three 

 following joints. 



Colour : Antenna? with the exceptions above mentioned, head, 

 thorax, pygidium, genital sheath, femora, first ventral segment, transverse 

 band on the first dorsal and lateral segments, two spots on second 

 ventral, and median spots on the last four dorsal segments, black ; 

 abdomen, with the above exceptions, red ; elytra honey-yellow ; wings 

 transparent honey-yellow, with a large fuscous cloud on the costal margin 

 toward apex ; tarsi and tibiae varying from black to yellow. The $ 

 abdomen varies from red to brownish. 



Male : Length, 7-9 mm. Similar to the female, with the following 

 exceptions: Antenna? double flabellate, 11-jointed, finely punctate 

 throughout, pale yellow, tipped with dark ; abdomen dark, with joints 

 of first three dorsal segments yellowish, membraneous. Legs yellow, with 

 black spot at junction of femora and tibiae. 



This species differs from Popenoi, semijlavus and scaber by having 

 the abdomen red in the % and black in the $ . From the first two 

 it differs by having the prothorax black, punctate, densely pubescent, 

 vertex pubescent ; from Pope7ioi by having the first joint of posterior tarsi 

 more than one-half longer than second ; from scaber by having the first 

 joint much thicker than the second. 



A large series of females was caught by the author on August 24, 25, 

 26, 1 90 1, and by Mr. Cary on August 26, on flowers of Solidago 

 Missouriemis, rigida and Canadensis, at Lincoln, Nebr. A large number 

 were also taken August 21, 1902, and during the following week. These 

 were, as a general rule, ovipositing in the buds of Solidago rigida, while a 

 few were on the flowers of Solidago Missouriensis. The distribution was 

 limited to the regions near the salt basins. 



A large swarm of males was caught flying in the region of colony of 

 Epinomia trianguli/era, Vachal, Perdita albipennis, and certain species 

 of Andrefia and JVomada, on August 25, 1901, by Mr. Crawford, on the 

 salt basins at Lincoln. Two males were caught on Solidago by the 

 author ; also two pairs on August 26 and 27, 1901. 



A A , taken from the Pine Ridge, in Northwestern Nebraska, 

 during July, has the antennae orange coloured, the clouding of the elytra 

 fulvous, and is slightly smaller. This may be a different species. 



