SYSTEMATIC ACCOUNT. 83 



Acrostichal hairs in six rows; no prescutellars. Mesonotum and scutellum dark dull 

 yellowish-brown. Pleurae and legs pale yellowish-brown. Apical and preapical bristles on 

 first and second tibise, preapicals on third. 



Abdomen shining yellow; an interrupted dark-brown band on the posterior margin of 

 each of the first four segments, and a median anterior dark-brown spot on the third, fourth, 

 and fifth segments. 



Wings with faint clouds on each cross- vein and at the tips of second and third veins; 

 veins dark brown. Costal index about 4.3; fourth vein-index about 1.7; 5x index about 

 1.3; 4c index about 0.7. 



Length body 2.5 mm.; wing 2.7 mm. 



Specimens examined: New Orleans, Louisiana (P. Viosca); Kushla, 

 Alabama (type material of modesta); Greenville, South Carolina; Rich- 

 mond, Arlington, Dead Run (R. C. Shannon), Rosslyn (R. C. Shannon), 

 Virginia; District of Columbia (type material); Plummer's Island, Mary- 

 land (R. C. Shannon); Bloomington, Indiana (F. Payne); Urbana, Illinois 

 (J. R. Malloch); Riverton, New Jersey (C. W. Johnson). I have also 

 reared the species from cabbage collected in New York City in November, 

 but I am inclined to suspect that the cabbage was infected somewhere in 

 the south before it was shipped to New York. 



I have reared this species in Alabama from banana, watermelon, sap 

 from a bleeding grapevine, and an agaricaceous fungus. It is easily kept 

 in the laboratory on banana. 



According to Dr. C. W. Metz, the eggs have four filaments. Dr. Metz 

 has also described the chromosomes (see p. 39). 



Drosophila immigrans, new species. (Plate 3, fig. 1.) 



D. tripunctata Sturtevant. 1918. Bull. Amer. Mus. Nat. Hist., 38, 445. Not Loew, 

 1862. Berlin, ent. Zeit., 6, 231. 



cf . Arista with about six branches above and three below. Antennse yellow. Front 

 over one-third width of head, wider above; j'ellow, ocellar dot dark brown. Second orbital 

 one-fourth size of other two. Second oral bristle over one-half length of first. Carina 

 broad, flat; face yellow. Proboscis yellow. Cheeks yellow; their greatest width about 

 one-third greatest diameter of eyes. Eyes with rather thick pile. 



Acrostichal hairs in eight rows; no prescutellars. Mesonotum and scutellum dull 

 brownish-yellow. Pleurae and legs pale yellow. Apical and preapical bristles on first and 

 second tibise, preapicals on third. A row of very short, stout bristles on lower apical part 

 of first femur. Basal joint of first tarsus about half as long as corresponding joint of middle 

 leg, and thicker. Second tarsal joint of first leg also somewhat shortened and thickened. 



Abdomen dull yellow, each of the four basal segments with an interrupted posterior 

 black band. The band on the fourth segment is sometimes entire. Fifth segment black. 



A single bristle at tip of first costal section (before distal break). Wings clouded at tips 

 of first and second veins and on posterior cross-vein. Costal index about 4.4; fourth-vein 

 index about 1.2; 5x index about 1.0; 4c index about 0.5. 



Length body 2.5 mm.; wing 2.7 mm. 



9 . Same as above, except basal tarsal joint of first leg about two-thirds as long as 

 corresponding joint of second leg, not thicker. Second joint of tarsus of first leg not 

 shortened or thickened. 



Type (cf) and gonotypes bred from stock collected at White Plains, 

 New York, 1919. As in the case of D. hydei, the gonotypes are not de- 

 scended from the type, but the whole type series is known to be descended 

 from a single female. 



Other specimens examined: Woods Hole, Attleboro (H. H. Plough), 

 New Bedford, Massachusetts; New York, Cold Spring Harbor, Staten 

 Island (F. Schrader), New York; Fort Lee, New Jersey; Springfield, Ohio 

 (W. S. Adkins); Arlington, Maryland (R. R. Hyde); Greenville, South 

 CaroHna; Lakeland (C. W. Metz), Daytona (B. B. Horton), Florida; 

 Kushla, Alabama; New Orleans, Louisiana (C. W. Metz); Claremont, 



