72 THE NORTH AMERICAN SPECIES OF DROSOPHILA. 



Drosophila paradoxa Lamb. 1918. Bull. Ent. Research, 9, 159. 



cf, 9. Arista with four branches above and one below. Antennae pale yellow. Second 

 and third orbitals inserted at the same level. Only one prominent oral bristle. Carina 

 absent. Palpi pale orange, clavate, with two small bristles near the tip. Eyes with sparse 

 pile. 



Acrostichal hairs in six rows; prescutellars well developed. A small dorsocentral bristle 

 in front of the two that are usual for the genus. Mesonotum pale yellow, rather shiny. 

 Scutellum and pleurae pale yellow. Legs pale yellow. Bristles and hairs brown. 



Abdomen yellow, slightly shining; last two segments darker posteriorly. 



Wings clouded along anterior margin and posterior cross-vein. Costal index a little 

 over 2; fourth-vein index about 1.6. 



Length body just under 2 mm.; wing the same. 



I have not seen this species. The above description is drawn entirely 

 from Lamb's admirable account of the type material. The species is known 

 only from St. Joseph, Trinidad, West Indies, where it was collected by 

 Mr. C. B. Williams. It is parasitic on a species of Clastoptera found on 

 Casuaritia trees. Williams collected about thirty spittle masses of this 

 frog-hopper, and "about half of these contained Drosophila larvae, most of 

 which had their heads buried in the abdomen of the Clastoptera nymphs, 

 the head being usually inserted between the dorsal abdominal plates." 



In the same paper Lamb has presented notes on another Neotropical 

 species of Drosophila, found by Williams in the froth of a Clastoptera in 

 Panama. The specimens were too fragmentary for description, and the 

 same is true of one that Mr. Williams sent me. 



Group B, 



Small prescutellars present; wings clear; bristles and hairs brown; dull-colored species. 

 Drosophila florae Stiirtevant. 1916. Ann. Ent. Soc. America, 9, 339. 



cf, 9. Arista with about four branches above and three below. Antennae dull brown, 

 third joint darker. Front about one-third width of head, wider above; dull yeUowish- 

 brown. Second orbital one-half other two. Second oral bristle about one-third first. 

 Carina broad, flat; face dull yellowish-brown. Cheeks yellow; their greatest wadth about 

 one-eighth greatest diameter of eyes. Eyes with fine black pile. 



Acrostichal hairs in eight rows; prescutellars present. Mesonotum, scutellum, and 

 pleiu-ae dull brown. Legs pale brown; apical and preapical bristles on first and second 

 tibiae; preapicals on third. Bristles and hairs brown. 



Abdomen dark brown; basal segment with a j'ellowish-brown transverse band. 



Wings clear. Costal index about 2.5; fourth-vein index about 1.8; ox index about 1.4; 

 4c index about 1 .0. 



Length body 2.2 mm.; wing the same. 



Specimens examined : Havana (type series), Guareiras, Cuba; Mayaguez, 

 Adjuntas, Naguabo, Porto Rico (Lutz and Mutchler); Tegucigalpa, Hon- 

 dur.as (F. J. Dyer); San Jose, Costa Rica. 



The species is to be found, often in great numbers, in the corollse of large 

 flowers such as those of species of Datura, melons, etc. I have reared adults 

 from Datura flowers collected in Costa Rica. Some of these took at least 

 eight days to develop — probably longer. 



The chromosomes of D. florce have been described by Metz (1916, Amer. 

 Nat., 50, 592; see p. 39 of this paper). 



Drosophila bromeliae, new species. 



9 . Arista with about five branches above and two below. Antennae yellow, third 

 joint darker. Front about one-third width of head, wider above; yellow. Second orbital 

 one-half other two. Second oral bristle less than one-half first. Carina prominent, flat; 

 face pale brown. Cheeks pale brown; their greatest width about one-sixth greatest diam- 

 eter of eyes. Eyes with fine short pUe. 



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