196 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



for the 22 species recorded from North American birds are given in 

 table 1. 



Insofar as the over-all taxonomy of the Dicrocoeliinae is concerned 

 it is here important only to point out certain duplication of taxonomic 

 effort that has appeared in the literature within recent years. In 

 studying a section of the subfamily, Bhalerao (1936) suggested that 

 the then 17 valid species assigned to the genus Eurytrema Looss, 1907, 

 showed characters sufficiently distinct for their separation into five 

 subgenera. The names Pancreaticum^ Concinnum, Conspicwmn^ and 

 Skrjahinus in addition to Lubens^ suggested by Travassos in 1920, 

 were proposed for these five subgenera. For the characters on which 

 this separation was made the reader is referred to Bhalerao's original 

 paper. 



Strom (1940), in working with dicrocoeliid trematodes from 

 Eurasian hosts, accepted Bhalerao's division of the genus Ewrytrema 

 but elevated the subgenera Lubens^ Conspicuum, Concinnum,, and 

 Skrjabinus to generic rank. He accepted the first three of these sub- 

 genera as defined by Bhalerao and retained the species as allocated 

 in the original paper, although transferring a more recently described 

 species, Eurytrema epomopis Sandground, 1937, to the genus Con- 

 cinnwn. After restudying the species Eurytrema shrjahinus Isiat- 

 schikoff, 1920, and E. koschewnikowi Skrjabin and Massino, 1925, the 

 only two species included in the subgenus Skrjabinus by Bhalerao, 

 Strom redefined the genus to include forms in which (1) the genital 

 pore is ventral to or near the pharynx; (2) the vitellaria occupy the 

 lateral margins of the body and extend from the region of the ace- 

 tabulum (or behind this level) to a point considerably beyond the 

 ovary; and (3) the uterus has numerous loops occupying the whole 

 body posterior to the acetabulum. Strom described 5 new species, 

 which he assigned to the genus Skrjabinus. 



In the same paper, Strom (1940) proposed a revision of the genus 

 Lyperosomum Looss, 1899, which now contained more than 50 species 

 and subspecies. Three genera, Lyperosomum {sensu stricto) , Brachy- 

 lecithum, and Corrigia^ were proposed for the reception of this 

 assemblage of species. Lyperosomum longicauda (Rudolphi, 1809) 

 was designated the type of the genus LyperosormiTYi^ and the genus was 

 restricted to those forms which showed (1) elongated bodies, 

 the anterior end of which tapered more abruptly than did the posterior 

 end; (2) subequal, muscular suckers, of which the acetabulum is the 

 larger; (3) ceca ending in advance of the caudal extremity of the 

 body ; (4) testes oblique or symmetrical and close behind the acetab- 

 ulum ; (5) genital pore near the midline, at the posterior level of the 

 pharynx; and (6) vitellaria consisting of numerous small follicles 

 which extend from the zone of the testes to a level far short 



