1912 Pomona Coi.i.ege Jodrnai, of Entomologv, Vot. IV, No. 3, Decembek. 



Tllli AMERICAN SPECll-S OF ADHLIMIOMVIA 

 HEK(iKOTll {Tli*VHDAL D11>1.) 



CllAlfLKS r. ALEXANDER 

 rrilACA. NEW VOKK* 



The small size of tile era nc- Hit's eoiistiUitiii^ the <remis Aihlpliomyia 

 Bergr.' entitles them to the iiaine ol' Miero-limnopliilini, the majoi-ity ol' the 

 described forms Iwinj^ inueli siiiallcr than mnubers of allied genera. 



Some eonfusiou has arisen recently, r(>garding the identity of the most 

 common of the three known American species and the purpose of the present 

 article is to straighten out this imbroglio. Tiie first mention of an American 

 representative was in an article by the author- in which a new species 

 (iniuuia) was described and a second species referred, provisionally, to the 

 widely-distributed European form, sniiiis Hal. This latter species was again 

 mentioned, and its venation iigured in a second article-' and here, also, was 

 referred to xcnilis. There has always l>eeu a question in my mind regarding 

 the specific identity of the American and Eurojjean forms and I have taken 

 the opportunity to send specimens to Mr. F. W. Edwards, who kindly com- 

 pared the American species with European specimens of senilis/ in the British 

 Museum collection and reports that the two forms are distinct. I give a key 

 to the known American s|)cci(s and drsci-il/r twu new foiins. 



American Species of Adelphomyia 



1. Wings with cell Ml ab.sent. cayuga sp. n. 

 Wings with cell Ml present. 2 



2. Pubescence in cells of wings lacking or sparse: cross-vein /• not 



evident; cross-vein m sIku-I or obliterated: genei'ai color of body 

 pale yellow. ininuin Alex.- 



Pubescence in cells of wings conspicuous; ci'oss-veius r and in 

 distinct: body color more brownish. ainericana sp. n. 



Adelphomyia americana sp. n. 

 Pill .lr/<//>/io,„/yw .s(/(//(.s- Alexander. Can. Ent. 

 1911 Adclphiittiijid senilis iWiiWiXidcr. Ent. News. 



Small species (length, $, 8.8-4 mm.); radial cross-vein present: cell Ml 

 present ; plura^ almost unicolorous, dull yellow. 

 S Length, 3.2-3.5 nnn. ; wing, 4.3-4.6 mm. 

 Foreleg, femur, .3.7 mm.; tibia, 4.1 nun.; tarsus, 3.8 mm. 

 Middle leg, femur, 3.9 mm. 

 9 Length, 3.8-4 nun.; wing, 'i-v^M nnn. 



Contribution from tlic Entf)nu)logical Laboratory, Cornell University. 



1 Bergrotli; Mittlieil. Xaturf. Gcsell. Bern; p. 134; 1891. 



2 Alexander; Canad. Entom.; .Aug. 1911. 



3 .Alexander; Entomol. Xews; Oct. 1911. 



