408 Professor Williston on the 



2. Drosophila vittatifrons , n. sp. (PI. XIIT., fig. 152, 



wing.) 



(? , ? . Front about one- third of the width of the head, a little 

 broader above ; yellow, the slender shining median triangle reach- 

 ing two-thirds of the distance to the root of the antennae, on 

 either side of which there is a deep brown or black stripe, the two 

 convergent anteriorly. Antenna yellow, third joint somewhat 

 brownish, and elongate oval in shape. Face pallid-yellow, in the 

 middle with a very prominent carina ; cheeks with a brownish spot 

 below the eyes. Palpi blackish at the tip; proboscis and the 

 lower portion of the occiput, yellow. Mesonotum shining yellow 

 with six slender brown stripes, the median pair separated by a line, 

 the outer ones not continued in front of the suture ; more out- 

 wardly in front, on either side there is a slender strigula reaching 

 as far as the suture. Pleurae and legs wholly yellow. Abdomen 

 black, the immediate base yellowish ; the narrow lateral margin of 

 the second and third segments, and the fourth and fifth except a 

 median triangle, yellow. Wings nearly hyaline ; a blackish sub- 

 quadrate spot at the tip of the wing, in the submarginal and first 

 posterior cell, reaching from the tip of the second to the tip of the 

 fourth vein ; second section of the costal vein more than twice 

 the length of the third section. Length l|-2 mm. 



Numerous specimens. With these specimens there 

 are several in which the front is yellow or brownish-yel- 

 loWj and the spot at the tip of the wing is apparent only 

 as a blackish cloud. They appear to be immature 

 specimens. 



3. DrosopMla sororia, n. sp. 



$ , $ . Head and antennae yellow, opaque ; front rather more 

 than one-third of the width of the head, a little broader above ; 

 arista with only a few rays. Thorax light reddish-yellow, opaque. 

 Abdomen reddish-brown or blackish, probably in life with black 

 hind margins to the segments. Legs wholly yellow. Wings 

 lightly tinged with blackish, more noticeable along the costa and at 

 the tip ; a rather broad, dark cloud on the cross-veins, and indis- 

 tinct clouds on the veins at the tip of the wing, that of the second 

 vein, however, distinct ; third section of the costal vein short; 

 posterior cross- vein straight. Length 1^ mm. 



Four specimens. St. Vincent. 



