366 Annals of the Carnegie Museum. 



strong^) reclinate bristle, which is closer to the proclinate bristle and 

 situated somewhat nearer the eye; this minute bristle, or setula, is 

 more or less evident for instance in D. mela?iogaster Meigen (= ampelo- 

 phila Loew and uvaruni Rondani) ; and in D .repletaW oWdi&ton { = pnnctu- 

 lata Loew and adspersa Mik) it is very distinct. In D. quinaria Loew 

 it is very minute and in D. dimidiata Loew^" this setula is exceedingly 

 minute, but yet distinct from the orbital row of minute hair-like setulae. 

 I have seen neither L. maculata Dufour nor L. quinquemaculata 

 Strobl of Europe and to therefore contradict the statement by so 

 eminent a dipterologist as Professor Strobl, that these two species 

 have only two fronto-orbital bristles and that they do not possess the 

 third or upper fronto-orbital bristle, might seem perhaps presump- 

 tuouF, but, as Professor Strobl does not mention the vertical bristles, 

 I am almost inclined to suspect that he has overlooked the third or 

 uppermost fronto-orbital, considering it one of the vertical bristles; 

 it would, indeed, be a very peculiar fact that the two European species 

 should have only two fronto-orbitals, while the third or uppermost 

 fronto-orbital, which is always strong in Drosophilince, should be 

 missing, whereas the many species of Leucophenga before me from very 

 distant localities all have three strong fronto-orbitals. Whether or 

 not my suspicion is correct concerning the statement of Professor 



^ Drosophila obesa Loew from Texas is described by its author as having three 

 strong fronto-orbital bristles: "fronte latissima praeter setas verticis utrinque setis 

 tribus validisarmata" {Berl. Ent. Zeilschr., XVI (1872), p. 102 (Cent. X, 85). 



^^ Berl. Ent. Zeilschr., VI, 1862, p. 230 (Cent. II, 95). Drosophila dimidiata 

 appears not to have been recorded since Professor Loew described it from Illinois. 

 I have captured it on several occasions on windows and on tree-fungi at Pittsburgh, 

 Pennsylvania, the first time Aug. 18, 1906, and in later years during all the months 

 from July 20-Oct. 21; it is a true Drosophila. As the original description does not 

 touch upon the chaetotaxy I use this occasion to do so and to add a few other re- 

 marks. It is a beautiful species with eyes in life of a pure and clear, rather prettily 

 dark purple color (in the field I wrote on two specimens "Eyes crimson"); face with 

 a prominent carina; thorax strongly convex; scutellum convex; abdominal black 

 marks variable; the lower reclinate fronto-orbital bristle exceedingly minute; the 

 postverticals well developed, touching at tips; a second quite well-developed humer- 

 al; the presutural and the anterior supra-alar well developed, though much smaller 

 than the posterior supra-alar and anterior postalar bristles; the posterior postalar 

 minute, but distinct; the anterior dorso-central very minute, situated unusually 

 near the strong jjosterior one and easily overlooked; prescutellar pair not developed, 

 that is, not differentiated from the setul.x of mcsonotum; the lateral pair of scutellar 

 bristles only about half the size of the decussate apical pair. 



