78 THE NORTH AMERICAN SPECIES OF DROSOPHILA. 
The eggs have two filaments. The larve have curious processes on their 
surfaces, resembling those of certain Anthomyiine. Development requires 
about two weeks. A flourishing culture of this species will usually smell 
of ammonia rather than of acetic acid, as in most of the fruit-eating species. 
The chromosomes reported by Metz, two mutations reported by 
Warren, and the mating habits are described elsewhere in this paper. 
The larva and pupe have been described by Johannsen (1910, Bull. Me. 
Agr. Exper. Sta., 177, 37), and also by Riley (1918, Report State Entomol. 
Minn., 17). In the latter case the specific determination was not made, 
but the description and the food-habits are sufficient to identify the species 
as this one. The pupze were found in bottles containing certified milk, 
and were referred to by the farmers as “hay-seeds.” 
Group F. 
Typical species. Subgroup 1; yellowish or reddish species. 
Drosophila albirostris, new species. 
o. Arista with seven branches above and four below. Antenne yellow, third joint 
darker. Front over one-third width of head, wider above; yellow. Second orbital minute. 
Only one prominent oral bristle. Carina rather broad, flat; face white. Cheeks yellow; 
their greatest width about one-sixth greatest diameter of eyes. Eyes clothed with fine 
yellow pile. 
Acrostichal hairs in six rows; no prescutellars. Mesonotum and scutellum shining 
reddish-yellow. Pleurz and legs pale yellow. Apical and preapical bristles on first and 
second tibiz, preapicals on third. 
Abdomen yellowish red, each segment with a broad black posterior band; these bands 
are thickened in the mid-dorsal line. 
Wings grayish, posterior cross-vein clouded. Costal index about 3.0; fourth-vein index 
about 1.7; 5x index about 1.0; 4c index about 0.8. 
Length body 2.0 mm.; wing 2.2 mm. 
Type and only specimen, Panama, Republic of Panama, February— 
March 1915. 
Drosophila metzii, new species. 
o. Arista with seven branches above and three below. Antenne reddish brown, 
third joint darker. Front over one-third width of head, wider above; reddish brown, 
ocellar dot darker. A short transverse impression above base of antennz. Second orbital 
minute. Only one prominent oral bristle. Carina very prominent, broad, flat; face white. 
Cheeks yellowish brown; their greatest width one-sixth greatest diameter of eyes. Eyes 
with short, fine pile. 
Acrostichal hairs in six rows; no prescutellars. Mesonotum and scutellum shining 
reddish-brown. Pleure and legs brownish yellow. Preapicals on all tibia, minute apicals 
on first and second. 
Abdomen black, somewhat shining; first segment brown at base. 
Wings clear. Costal index about 4.0; fourth-vein index about 1.3; 5z index about 1.0; 
4c index about 0.7. 
Length body 2.4 mm.; wings 2.5 mm. 
Type and only specimen, Herradura, Cuba, February 6, 1915 (C. W. 
Metz). 
Drosophila cardini Sturtevant. 1916. Ann. Ent. Soc. America, 9, 336. 
o, @. Arista with about five branches above and two below. Antenne yellow, third 
joint brown. Front over one-third width of head, wider above; reddish yellow, orbits 
grayish. Second orbital about one-fifth other two. Carina broad and flat; face brownish 
yellow, somewhat polished. Two prominent oral bristles, nearly equal. Cheeks yellow; 
their greatest width about one-fifth greatest diameter of eyes. Eyes clothed with short pile. 
Acrostichal hairs in six rows; no prescutellars. Mesonotum, scutellum, and pleure 
shining reddish-brown. Legs yellow. Apical and preapical bristles on first and second 
tibiz, preapicals on third. 
