78 THE NORTH AMERICAN SPECIES OF DROSOPHILA. 



The eggs have two filaments. The larvte have curious processes on their 

 surfaces, resembling those of certain Anthomyiinaj. 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 pupae 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 pupae 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. 



cf . Arista with seven branches above and four below. Antennae j'ellow, 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-sL\th greatest diameter of eyes. Eyes clothed with fine 

 yellow pile. 



Aorostichal hairs in six rows; no prescutellars. Mesonotum and scutellum shining 

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

 second tibiae, 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. 



d^. Arista with seven branches above and three below. Antennae 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 antennae. 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. Ej^es 

 with short, fine pile. 



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

 reddish-brown. Pleurae and legs brownish yellow. Preapicals on all tibiae, 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; 5x 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. 



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

 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 poUshed. 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 pleurae 

 shining reddish-brown. Legs yellow. Apical and preapical bristles on first and second 

 tibiae, preapicals on third. 



