54 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 Cladochceta nebulosa and Drosophila nebulosa have the habit of waving 

 their wings as do the species of Chymomyza. 



The type and onlj-- species is Cladochceta 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. Verb, 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 hairj'; three 

 orbitals, disposed as usual; no carina; cheeks very narrow; one dorsocfentral; 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 larvae feed on species 

 of Aleurodes. 



Blaesochaetophora Czerny. 1904. Wien. ent. Zt., 206. 



Two orbitals; ocellars present; postverticals crossed; vibrissse 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 tibiae; arista pubescent; auxiHary vein rudimentary; 

 costa twice broken; anal vein present; third and fourth veins not convergent. Among 

 the forms with pubescent arista and rudimentary auxihary vein this genus is distinct in 

 that the ocellars and four pairs of dorsocentrals are present, while preapicals occur only on 

 the first tibiae. 



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; vibrissae 

 present; carina large; front not unusually hairy; no preapicals evident; two dorso- 

 centrals; prescutellars present; two pairs of scutellars; auxiliary vein rudiment ar\-; discal 

 and second basal ceUs 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. S. 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 tibiae; vibrissas 



