402 • PROCEEDINOS OF THE NATIONAL MUSEUM. vol. xxxi. 



hairs, also present on the trochanters; rest of the legs ferruginous 

 except the tips of the chiws (Phite IX, tig. lis), which are black; 

 spines feri'ugiuous; hind tibiiv yellow sericeous behind, their inner 

 contour straight; fore metatarsi with nine (or sometimes ten) comb 

 teeth, more than half as long as the metatarsus. (Plate VI, tig. 5). 



j\I((l('. — Diti'ei's from the female as follows: Anterior margin of the 

 clypeus k'ss retiexed, broadly l)ut slightly emarginate, without teeth; 

 anterior tooth of the mandi))k^ less divided; legs more generally seri- 

 ceous; fourth, fifth, sixth, and seventh ventral abdominal plates emar- 

 ginate, this increasing posteriorly so that the seventh is quite deeply 

 notched; the hfth, sixth, and seventh plates each with short ferrugi- 

 nous-brown hairs, particularh^ at the sides, where the}^ almost form 

 tufts; terminal plate with its posterior margin rounded at the sides, 

 acuminate in the middle, very slightly carinate along the median line; 

 last three plates above quite hairy; dorsal terminal plate sometimes 

 with a median longitudinal groove on its anterior portion; its posterior 

 margin evenlv rounded; transverse median vein of the hind wing gen- 

 erally less arched and making no more than a right angle with the 

 median ^■('in. 



Var/((f!(>iix. — In some cases there are l)lack areas on all the doi'sal 

 abdominal plates; the femora also show a few black markings, and 

 less often the entire abdomen may be nearly all almost black. North- 

 ern specimens are liable to be particularly hairy, the hairs being pale 

 yellow, giving the insects a fuzzy, pale, yellowish brown appearance, 

 and partly concealing the pubescence, which also seems to be less 

 developed in such specimens. 



Length. — Females, 20-25 mm.; males, 16-23 ram. 



This species has probably thg widest distribution of any of the 

 Chlorioninw in America. I have seen specimens from Maine, New 

 Hampshire, Massachusetts, New York, Ontario, Wisconsin, Michigan, 

 Illinois, and Colorado on the north, and from almost ever}" State 

 southward to Florida, Texas, New Mexico, northern and southern Cal- 

 ifornia, Utah, Nevada, and Colorado. I have also seen it from Mex- 

 ico, and it is reported by Fox and Ducke from Brazil. Kohl and 

 Cameron state that it occurs in Guatemala, Nicaragua, Costa Rica, 

 Panama, Guiana, Venezuela, Cuba, Jamaica, and Santo Domingo. 

 These last lists, however, include the subspecies, and I have no means of 

 determining in which of these localities the typical form of the species 

 occurs. 



In Massachusetts it is taken in late June, Jul}^ August, September, 

 and rarely in early October. It visits the flowers of sumach, clematis, 

 asclepias, mint, ceanothus, and other j)lants. 



A specimen of this species from Para, Brazil, has a ferruginous 

 petiole, but in all other regards seems to be typical. 



This species is well pictured in the Insect Book (Plate V, tig. 18). 



