o4 THE NORTH AMERICAN SPECIES OF DROSOPHILA. 
The genus is in many respects between Drosophila and Chymomyza, but 
differs from both in the reduction of the branches of the arista to one. 
The small carina, pigmented wings, small postverticals, and bare eyes are 
all suggestive of Chymomyza, but the orbitals are like Drosophila. The 
superficial resemblance to Drosophila nebulosa Sturtevant is very striking. 
Both Cladocheta nebulosa and Drosophila nebulosa have the habit of waving 
their wings as do the species of Chymomyza. 
The type and only species is Cladocheta nebulosa Coquillett, 1900 (Proc. 
U.S. Nat. Mus., 22, 264). 
Specimens examined: Arroyo, Bayamon, Mayaguez, Vieques Island, 
Porto Rico (A. Busck, type series); Herradura (C. W. Metz), Havana, 
Cristo (C. W. Metz, F. E. Lutz), Guantanamo (C. W. Metz), Cuba; Mot- 
zorongo (H. Osborn), San Rafael (Townsend), State of Vera Cruz, Mexico; 
Lake Worth, Florida (Mrs. Slosson). 
Nothing is known as to the breeding-habits of this form, though my 
observations lead me to suspect that it breeds on fruit. The chromosomes 
have been described by Metz (see p. 39). 
Acletoxenus Frauenfeld. 1868. Verh. zool.-bot. Ges. Wien, 28, 158. 
The single species of this genus, A. formosus Loew, has sometimes been 
placed in the genus Gitona. Oldenberg (1914, Arch. Naturgesch., 80, A, 
4, 28) has presented reasons for separating the genera. The following 
characters are taken from his account: 
Arista pubescent; no ocellars; postverticals small, convergent; front not hairy; three 
orbitals, disposed as usual; no carina; cheeks very narrow; one dorsocentral; one pre- 
scutellar; two well-developed supra-alars; presutural and postalars small; no preapicals; 
costa well developed to apex of fourth vein. 
Acletoxenus formosus Loew occurs in Europe. The larve feed on species 
of Aleurodes. 
Blesochztophora Czerny. 1904. Wien. ent. Zt., 206. 
Two orbitals; ocellars present; postverticals crossed; vibrissze present; a pair of pre- 
scutellars; one humeral; one presutural; two notopleurals; three ‘“supra-alars”’; four 
dorsocentrals ; a long propleural; three sternopleurals; two pairs of scutellars, posterior 
pair crossed; preapicals only on first tibiz; arista pubescent; auxiliary vein rudimentary; 
costa twice broken; anal vein present; third and fourth veins not convergent. Among 
the forms with pubescent arista and rudimentary auxiliary vein this genus is distinct in 
that the ocellars and four pairs of dorsocentrals are present, while preapicals occur only on 
the first tibie. 
Type and only species: Leria picticornis Bigot (1888, Miss. scient. du 
Cap Horn, 6), from Cape Horn. 
Sinophthalmus Coquillett. 1904. Proc. Ent. Soc. Wash., 6, 116. 
Arista minutely pubescent; three orbitals, placed high up; postverticals small; vibrissz 
present; carina large; front not unusually hairy; no preapicals evident; two dorso- 
centrals; prescutellars present; two pairs of scutellars; auxiliary vein rudimentary; discal 
and second basal cells separated; costa reaches fourth vein, not weakened beyond third. 
There is a single species, S. pictus Coquillett. It is somewhat similar to 
Drosophila repleta in general appearance. It is stated by several collectors 
to have the habit of getting into one’s eyes. 
Specimens examined: Mountains near Claremont (C. F. Baker, type), 
Yosemite (U. 8. Nat. Mus. coll.), Mount Lowe (Aldrich coll.), California. 
Gitona Meigen. 1830. Syst. Beschr., 6, 129, 215. 
Gitonides Knab. 1914. Insec. Inscit. Menstr., 2, 165. 
Arista minutely pubescent; three orbitals; front hairy below, but less so above than 
in Pseudiastata; carina present; prescutellars present; preapicals on all tibie; vibrissz 
