1912 Pomona College Jocrnai, ok Entomolooy. Vol. IV, No. 3, Dkchmbkr. 



Tin: AMERICAN SPECIES OE ADELl'llOMVlA 

 BEKGKOTH (TIPULIU.E DlPl.) 



CIIARLKS P. ALEXANDER 

 ITHACA. NEW YORK* 



The small size of the emno-Hies r<iiistituliim- the liciiiis Adelphomyia 

 Bergr.' entitles them to the uame of .Mic-id limndpliilini. Ilic majority ol' tlie 

 deseribed forms heing imu-ii smaller than iiicinl)crs of allied genera. 



Some eonfusion has arisen reeeutly, regarding the identity of the most 

 eonnnon of the three known Ameriean speeies and the [)Ui'|)ose of tlie present 

 artiele is to straighten out this imhroglio. Tiir lirsl mention of an American 

 representative was in an article hy the author- in whii'ii a new .species 

 {nniiulin was (h>scrii)ed and a second species referred, [)rovisionally, to the 

 widely-distrii)nted Enropean form, sciiilis Hal. This latter s|)ecies was again 

 mentioned, and its venation hgured in a second ai'tiehr and here, also, was 

 referred to sciiiiis. There has always iM'cn a i|ucstiiin in my mind regarding 

 the specific identity of the Ameriean and Eurnpi-an foi'ins and 1 iiave taken 

 the opportunity to send specimens to iMr. F. W. Edwartls, who kindly com- 

 pared the American spt'cies with European specimens of scniiis in the British 

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

 to the known Amei'ican sjieeies and descrihe two new forms. 



American Species of Adelphomyia 



1. Wings with cell .Ml ahsent. caijuga sp. n. 

 Wings with cell .Ml present. 2 



2. Pubescence in cells of wings lacking or sjiarse; eioss-veiti /• not 



evident; cross-vein >n short or obliterated: genei-il eojor of body 

 pale yellow. minuta Alex.= 



Pubescence in wills of wings conspicuous; cross-veins ;• and )ii 



distinct; body color more firownish. anicricann sp. n. 



Adelphomyia americana sp. n. 

 1911 Adelphomyia .senilis Alexander. Can. Ent. 

 1911 Adelphomyia sorilis Alexander. Ent. News. 



Small species (length, 5, 3.8-4 mm.) ; radial cro.s.s-vein present; cell Ml 

 present ; plursE almo.st unicolorous, dull yellow. 

 6 Length, 3.2-3.5 nun. ; wing, 4.3-4.6 mm. 

 Foreleg, femur, 3.7 mm.; tibia. 4.1 mm.: tai-sus, 3.8 mm. 

 Middle leg, femur, 3.9 nun. 

 9 Length, 3.8-4 mm.: wing, 5-5.3 mm. 



Contribution from the Eiitoniological Lat^oratory, Cornell University 



1 Bergroth; Mitthcil. Xaturf. Gcscll. Bern; p. 134: 1891. 



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

 3.Me.xander; Entomol. News; Oct. 1911. 



