HEI^MESTTH PARASITES OF BIRDS DENTON AND BYRD 197 



of the caudal extremity. Strom retained 12 species in the genus 

 LyperosomuTn. 



In the second genus, ^r«<? Ay Ze(7«^Awm, Strom (1940) placed 25 species 

 and 3 varieties formerly assigned to the genus LyperosoTimmi. The 

 species -fllKAn (Dujardin, 1845) was designated as the type of the new 

 genus. The generic group was briefly characterized as (1) possessing 

 vitellaria composed of relatively few large follicles which occupied a 

 small area just posterior to the ovary; (2) genital pore in the midline, 

 ventral to the intestinal bifurcation; and (3) either one or two 

 intestinal ceca which fail to reach the caudal end of the body. 

 Brachylecithum {=Ly'peroso7num) flwni was redescribed and figured. 

 The species was represented as having branched intestinal ceca. 



The third genus, Corrigia^ proposed by Strom (1940) for species 

 previously included in Lyperosomum^ carried Corrigia {=Lypero- 

 sofjiimi) corrigia (Braun, 1901) as the type. The group showed the 

 following characters : (1) Body long and semitransparent ; (2) weakly 

 muscular suckers of approximately the same size; (3) two intestinal 

 ceca which almost reach the caudal tip of the body; (4) genital pore 

 ventral to or just posterior to the intestinal bifurcation; and (5) 

 vitellaria consisting of numerous small follicles extending from the 

 region of the ovary to a level behind the middle of the body. Four 

 other species were assigned to the genus. 



Travassos (1919) created the genus Oswaldoia for the reception of 

 his species oswaldoi and transferred Dicrocoeliwn skrjabinus Solowi- 

 ow, 1913, and Lyyerosoimxm direptwm Nicoll, 1914, to that genus. 

 Since the erection of the genus several additional species have been 

 described and assigned to Ostoaldoia by various authors. Strom 

 (1940) accepted Travassos' diagnosis of Oswaldoia and retained it 

 as a valid genus for the species O. oswaldoi Travassos, 1919, O. mar- 

 quesi (Travassos, 1922), O. petiolatum (Railliet, 1900), O. direptum 

 (Nicoll, 1914), and O. paioloivskyi (Strom, 1928). Later, Travassos 

 (1941b) erected the genus Lutztrema for the reception of those mem- 

 bers of the genus Lyperosomum which possessed but a single cecum. In 

 the genus, Travassos included the species formerly known as Lypero- 

 somtmi ohliquwm Travassos, 1917, L. transversimi Travassos, 1917, 

 and L. monenteron Price and Mcintosh, 1935, as well as three new 

 species, L. Tnarinholutzi^ L. vermcosii/m, and L. insigne. On the basis 

 of published figures alone Travassos provisionally includes several 

 other species in his genus Lutztrema. 



Being unaware of the paper published by Strom in 1940, Travassos 

 (1944) elevated the subgenera Concinnwm and Conspicuum, of Bha- 

 lerao (1936) to generic rank. This writer, however, retained Lubens 

 and Skrjahinus as subgenera of the genus Eurytreraa. As defined by 

 Travassos the genus Conspicwimi is identical with the genus Skrjahi- 

 nus as diagnosed by Strom. It is possible, therefore, to declare these 



