1896.] NATURAL SCIENCES OF PHILADELPHIA. 105 



Of 46 $ s from Verbesina, 43 are verbesince and 3 helianthi. The 

 The earliest date for helianthi is July 29, 1893. (CklL, 339, a ^ .) 

 On Aug. 26, 1893, I took both sexes at Juarez, Mexico ; these were 

 recorded as alhipennis and hyalina in Ann. Mag. N. Hist., Feb., 

 1895, p. 206. 



Mut. ^ , pasonis. — Length 8J mm. Resembles verbesince in its 

 dull front and the absence of spots on hind margin of prothorax. 

 Resembles typical albipennis by the absence of yellow on the abdo- 

 men. Resembles helianthi by the dark flagellum which is black 

 above, dull testaceous below. Maxillary palpi with the last four 

 joints practically equal. Front and mesothorax olive-green, cheeks 

 and metathorax greenish-blue or prussian-green, in strong contrast. 

 Tip of abdomen unusually broad. Marginal cell somewhat longer 

 than usual. 



I took one specimen of this at El Paso, Texas, Aug. 25, 1893. I 

 was a little perplexed whether to refer it to verbesinoi or albipennis. 

 Mr. Fox named it hyalina Cr., and indeed it must come very near 

 the form so named by Cresson, which had the dark flagellum, 

 though the head and thorax were bluish-green. 

 Var. $ lingualis. 



Length about 10 mm. Abdomen above with yellow bands on 

 segments 2-4, the first two narrowly interrupted in the middle, the 

 last two failing some distance before the lateral margin. Metatho- 

 rax dark blue, head dark blue-green, mesothorax and scutellum 

 dark olive-green. Front moderately shiny. Hind border of pro- 

 thorax marked with yellow. Stigma inclining to pale orange. Sec- 

 ond subraarginal cell not narrowed half to marginal. Flagellum 

 dark. Clypeus yellow with two black blotches above, sufficient 

 to mark out the yellow T. 



The above characters are probably, in part, individual ones, but 

 the glossa is very conspicuously hairy all along, thus differing from 

 that of helianthi, albipennis type, and verbesince, in which it is com- 

 paratively naked, except the terminal half in some examples oi ver- 

 besince. When using a compound microscope to more accurately 

 determine the character of the glossa, I was surprised to find also a 

 difference in the maxillary palpi. In lingualis the last two joints 

 of these palpi are short and of equal length, while the two before 

 them are long and also equal. In helianthi the last joint is long, 

 the two before it short and equal, and the two before them long and 

 equal to one another and to the last. 



The var. lingualis is founded on a single 9 from Fort Collins, 

 Colorado, Aug. 8,'1895. (Baker.) 8 



