382 Annals of the Carnegie Museum. 



of the arista as seen in eight of the specimens are six above, four or 

 three below. In life the abdomen may be slightly shining, with the 

 black markings opaque, and the mesonotum provided with a thin 

 whitish bloom. Unfortunately the specimens were packed in small 

 pill-boxes in such a way, that they could not be handled before being 

 slightly relaxed, and the exact color may through this process have 

 been damaged, as in my experiment with the type of L. argenteiventris. 

 The celebrated French biologist, Leon Dufour, reared and described 

 L. maculata of Europe and found that in some specimens the abdomi- 

 nal spots were coalescent and in others showing an extra spot on second 

 segment.^*' Similar variations in L. ornativentris may be expected. 



L. ornativentris agrees in many respects with the description of 

 L. frontalis Williston, from St. Vincent, West Indies,'' but is distin- 

 guished by its shorter antennae, its broad black uninterrupted band 

 on the lateral margins of the dorsum of abdomen, and by the compara- 

 tive length of the ultimate and penultimate sections of fourth vein. 

 The abdominal markings are also much like those of Drosophila piil- 

 chra Schiner from South America,'^ but this species is not a Leiico- 

 ' phenga, as Schiner would certainly not have failed to mention that 

 the costa reached to third vein only, as in his next species, Drosophila 

 insiilana, which is a Lencophenga. 



7. Leucophenga sp. 



There is in the collection of the Carnegie Museum a specimen of 

 Leucophenga, captured by Dr. J. D. Haseman at Sapucay, Paraguay, 

 April 4, 190Q, and bearing the label Carn. Mus. Ace. No. 3793. It is 

 very much like ornativentris. but although the differences seem great 

 enough I hesitate to give it a name, as it is immature and somewhat 

 shrunken. The differences from ornativentris are a light brownish 

 dash on apex of costal cell, extending through the bases of marginal 

 and submarginal cells into first basal cell. The apical half of the 

 second vein is bordered with light brownish; the ultimate section of 

 fourth vein seems to be not more than twice the length of the penulti- 

 mate section; the posterior cross- vein is not at right angles with the 

 fourth vein, but runs obliquely outwards to the fifth vein; the third 

 and fourth veins seem to be slightly divergent at apex, making the 



^^ Ann. des Science. Nat., 2e Scrie, Zool. Torn. XII, 1839, p. 51. 

 1' Trans. Enl. Soc. London, 1896, Part III, p. 413. 

 ^^ Diptera, Reise der Novara, 1868, p. 239. 



