from the Rio Nautla, Stale of Vera Cruz. 29 



opalescent cujneous reflection, but still entirely contrasted in 

 colour with the thorax ; clothed with yellovv hair only on 

 base and edges, with black hair on whole dorsum. Second 

 and third abdominal segments broadly dull brownish yellow 

 on anterior corners, in a triangular form on second but little 

 separated from hind margin, in a subquadrangular form on 

 third confined to anterior half. Fourth segment with a 

 smaller less distinct triangle of same colour on anterior 

 corners. Pubescence of abdomen somewhat longer and 

 thicker, that of the light parts being yellow. 



32. Vuhicella opalina, sp. n. 



Three female and five male specimens, San Rafael. The 

 males, one each, July 6, 7, and 9, and two, July 10. The 

 females, two July 9 and one July 17. All on flowers of the 

 Cordia sp. 



Length nearly 10 to 11| millim. 



Difters from V. cordice as follows : — Face and cheeks 

 entirely without stripes. Front shining brighter greenish, 

 with silvery pollen on each side, extending in narrow border 

 along orbital margin to vertex. Frontal triangle of male as 

 in nautluna. Antenna3 in both sexes considerably smaller, 

 the third joint not so much narrowed apically. Pubescence 

 of thorax of male as described for nautlana, with the black 

 pubescence more conspicuous than the shorter yellowish or 

 whitish ; in the female the yellow pubescence is, if anything, 

 more conspicuous than the black, being exactly the same as 

 in male of nautlana. In two of the females the short 

 pubescence is whitish and the longer black is much less con- 

 spicuous, but is seen to be present; these same females diff'er 

 further from the other in hair of front being whitish, and they 

 may be considered to constitute a variety. Scutellum as in 

 nautlana, both as to colour and pubescence, but even more 

 nearly concolorous with thorax, with greenish, cupreous, and 

 violet reflections. Abdomen wholly without yellowish ; with 

 brilliant green, violet, and purple reflections, especially on 

 third and fourth segments. Underside of second and third 

 segments with mostly black hair in male, the white hair 

 being confined to basal edge, but the white more extensive in 

 female. Wings often with the yellow invading and tinging 

 the brown, and with some of the cells hyaline in the centre. 



Var. splendens, var, n. 



I propose this name to distinguish the two females (both 

 July 9) above mentioned as having the hair of front white. 



