246 S. W. WILLISTON, M, D. 



the greater dilatation of the third anteniial joint in the female. The 

 same feature occurs in H. Comstockii and H. apicalis at least. In 

 illucens it is also more reddish in color, or even wholly red. In all 

 my female specimens of this species, both North and South American, 

 the yellow spots of the second abdominal segment are much smaller 

 in extent, not reaching the hind margin as in the male. Three speci- 

 mens from Chapada, both male and female, have the posterior part 

 of the abdomen deep red, but I can discover no other differences. 



5 Hermetia albitarsis Fabricius, Syst. Aiitl. G3; Wiedemann, Aiiss. Ins. 



ii, 25; Macquart, Dipt. Exot. Suppl. i, 49; Schiner, Novara Expcd. 70. — 



S. America [Wied.]. Columbia [Schiner, Macquart]. 

 ? II. bimaculata Macquart, Hist. Nat. Dipt. i. 

 ? H. sexmaculatn Macquart, Hist. Nat. Dipt. i. 

 n. plaiiifrons Macquart. Dipt. Exot. Suppl. i, 50. — Yucatan. 



Two s[)ecimens, Chapada. Length 11 mm. The flat, bright sil- 

 very front with a slender, median, black strip, is characteristic of this 

 species. In one of my specimens the silvery tomentum reaches nearly 

 to the ocelli, in the other, not two-thirds of the distance. In the latter 

 specimen the base of the third antennal joint is reddish, the base of 

 the tibiae is not at all yellow, and the last two joints of all the tarsi are 

 darker, on the hind i)air blackish. In both, the ground color of the 

 front has four small yellow spots near the orbit, two below the ocelli 

 and two above the base of the antennas. The eyes are pilose, and 

 are marked, as in the two following, with an irregular four-sided 

 purple stripe on a green ground. 



(). Hermetia apicalis Wiedemann, Auss. Ins. ii, 25; Schiner, Novara 

 Exped. 70. — S. America. 



Two specimens, from Rio de Janeiro. Wiedemann's description 

 applies well. The species i-esembles the foregoing, but the front is 

 not plane and the wings and abdominal spots are different. The 

 front has four small yellow spots, as in the foregoing, and the eyes 

 are likewise pilose and similarly marked. The abdominal spots are 

 of the same size in both sexes ; in my male specimen yellow ; in the 

 other red. The third antennal joint is dilated in the female. H. 

 varipennis Bigot must be a closely allied species. 



7. Hermetia ceriogaster n. sp. 



%i 9- — Length 14 — 16 mm. Black, abdomen coarctate at base, antennpe long, 

 tarsi white, wings brown, eyes pilose. Antennse black, slender, the lamella 

 nearly twice as long as the preceding together, the third joint not dilated. 

 Front black, shining, the median protuberance strong; pile black, not silvery 



