504 PROCEEDINGS OF THE NATIONAL MUSEUM. 



KEY TO THE SPECIES OF LEiPONEURA SKUSE — Continued. 



3. Pleural stripes dark chestnut-brown and yellow, distinct; stigma clear cut, dark- 



brown •■ .pleuralis Williston (Cuba — St. Vincent Is.). 



Pleural stripes indistinct, or faintly indicated ; stigma faint or lacking 4 . 



4. A faint blue tinge on pleuroe; no stripes; mesonotum light brown, 



puella Williston (Lesser Antilles; Jlexico). 

 Pleurae plumbeous with a yellow stripe; mesonotum brownish-gray, 



puer, new species (Greater Antilles) . 



KEY TO THE SPECIES OF GONOMYIA MEIGEN. 



(Neotropical and Nearctic, excluding boreal forms.) 



1. Wings spotted blanda Osten Sacken ' (E. and SE. United States). 



Wings unmarked (except stigmal spot in cases) 2. 



2. Femora with a distinct brown anteapical band, 



sulphurella Osten Sacken^ (E. United States). 

 Femora unicolorous, imbanded 3. 



3. Antenns orange or yellow at the basis 4. 



Antennte entirely brown or black 5. 



4. Pleural stripes dark brown; Sc very short delicala, new species (Guatemala). 



Pleiual stripes reddish; Sc longer, ending slightly before the origin of Rs., 



cognatella Osten Sacken' (E. United States). 



5. Pleurae with a brown stripe running from collare to base of halteres, 



virgata Doane* (W. United States). 

 Pleurae without distinct stripes 6. 



6. PleuTK uniformly light yellow; bafal deflection of Cui at the inner end of the short 



cell first Mj subrinerea Osten Sacken ' (E. United States). 



Pleurae rich light brown; basal deflection of Cu,, under the middle of the long cell 

 first Mj unicolor, new species (Mexico and C. America). 



GONOMYIA CLEIPONEURA) PLEURALIS ' 



Atarba pleuralis Williston, Trans. Ent. Soc. Lond., 1896, p. 289, pi. 10, fig. 61, 

 male and female.— Coquillett, Proc. U. S. Nat. Mus., 1900, p. 250.— Ker- 

 tesz. Cat. Dipterorum, vol. 2, 1902, p. 189. — Aldkich, Cat. N. Amer. Dipt., 

 1905, p. 82.— Williston, Man. N. Amer. Dipt., 1908, p. 85 (fig. 32). 



Atabarba pleuralis Hunter, Trans. Amer. Ent. Soc, 1900, p. 290. 



Gonomyia pleuralis Alexander, Ent. News, vol. 23, 1912, p. 419. 



Male. — Length, 5.1 mm; wing, 3.4 mm. 



Female. — Length, 6.4 mm; wing, 5 mm. ^ 



Head: rostnma and palpi dark browni; antennae, basal two or three 

 segments light yellow, remamder brown; front, vertex and occiput 

 light yellow; a black spot on the vertex between the eyes. 



Thorax: meso thoracic praescu turn rich chestnut- brown, lateral and 

 cephalic margin broadly light yellow, this bordered internally by a 

 narrow line of darker brown; pseudosuture light brown, short, tri- 

 angular; scutum like the prsescutum; scutellum j'ellow with a narrow 



> Monographs, vol. 4, pp. 182, 1S3, male and female. 

 « Idem, pp. 180, 181, male and female. 



> Idem., p. ISl, male and female. 



« Joiim. N. Y. Ent. Soc., 1900, p. 189, pi. 7, fig. 21. 

 ' Monographs, voL i, pp. 181, 182, male and female. 



