PSYCHE 



VOL. XX. JUNE, 1913. No. 3 



A STUDY OF THE CLUSIODID^E, (HETERONEURID^E) 

 OF THE EASTERN UNITED STATES. 



By Charles W. Johnson. 

 Boston Society of Natural History. 



Since the publication of the "Revision der Heteroneuriden " by 

 P. Leander Czerny (Wien. Ent. Zeit. XXII, 61, 1903), it has been 

 apparent to the writer that there were many discrepancies and er- 

 rors in the determination of the American species. The want of 

 material, however, has caused me to hesitate in attempting to 

 define our species more clearly. It seems imperative that these 

 errors should be corrected and brought to the attention of future 

 workers. 



The species seem to separate quite readily into the genera de- 

 scribed by Czerny and Coquillett, based on the arrangement of the 

 cephalic bristles, and later tabulated by Dr. Williston in his 

 "Manual of North American Diptera." 



Clusiodes Coquillett. 



For the genus Heteroneura Fallen 1823, not 1810, Coquillett pro- 

 posed the genus Clusiodes 1904, Type H. albimana Meigen. The 

 four species belonging to this genus may be tabulated as follows: 



1. Wing with the clouding on the anterior portion confined to the apical third ... 2 

 Wing with the clouding extending from the end of the first vein geomyzina Fall. 



2. Legs with the anterior tarsi more or less black 3 



Legs entirely yellow; face of the cf black melanostoma Loew. 



3. First, or the first two anterior tarsal joints black, the others white 



albimana Meig. 



All of the anterior tarsal joints in the 9 and the last three or four joints in 



the cf black pictipes Zett. 



Clusiodes geomyzina Fallen. 



Heteroneura geomyzina Fall., Agromyz. 2. 2. 1823; Czerny, Wien. Ent. Zeit., 

 XXII, 77, Taf. I, f. 1, 2 and 4, 1903. 



One specimen was taken by the writer at Machias, Me., July 

 19, 1909, the first American record. 



