THE AMERICAN SPECIES OF ADELFHOMYIA 

 BERGKOTH (TIPULIDJi DIPT.) 



CHARLES P. AliEXANDER 

 ITHACA, NEW YORK* 



The small size of the crMiip-Hics constitiitiiifr tlii' fjcniis A(}(lp]io)in/ia 

 Bergr.' entitles tliciii to tiic lumic of .Micro-liiimophilini, the majority of the 

 described forms ln-iii^' much suiiillcr than mciiibers of allied genera. 



Some confusion has arisen recently, regarding the identity of the most 

 common of the tliree known American species and tlie purpos-e of the present 

 article is to straighten out tliis iml)roglio. The first mention of an American 

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

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

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

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

 referred to smilis. There has always l>een a (piestion in my mind regarding 

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

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

 pared the American sp<>cies witii 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 species and describe two new forms. 



American Species of Adelphomyia 



1. Wings with cell Ml absent. cai/iiga sp. n. 

 Wings with cell ill present. 2 



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



evident; cross-vein m short or obliterated; general color of body 

 pale yellow. minuta Alcx.- 



Pube.scence in c-ells of wings conspicuous; cross-veins r and in 



distinct : body color more bi'ownish. americatia sji. n. 



Adelphomyia americana sp. n. 

 1911 AdiJphduiyia senilis Alexander. Can. Ent. 

 1911 Adelphomyia senilis Alexander. Ent. News. 



Small species (length, 9, 3.8-4 mm.) ; radial cross-vein present; cell .Ml 

 present ; plunv almost unicolorous, dull yellow. 

 (J Length, 3.2-8.5 mm. ; wing, 4.3-4.() mm. 

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

 Middle leg, femur, 3.9 mm. 

 ? Length, 3.8-4 mm. : wing. S-.'j.S mm. 



Contribution from tlic Entomological Laboratory, Cornell University. 



1 Bergrotli; Mittheil. .\aturf. Gesell. Bern; p. 134; 1891. 



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



3 .-Me.xander; Entomol. Xews; Oct. 1911. 



