1932 ] Gerridx in the Museum of Comparative Zoology 109 
(Female). Broader than male. Anterior lobe of prono- 
tum only feebly raised above posterior lobe. Metanotum 
with a prominent, raised callosity on each side, these cal- 
losities pale and conspicuously hairy. Connexivum broader 
than in male, clothed along apical half with brownish hairs, 
these becoming longer and more numerous distally; the 
apices, strongly produced into long, upwardly curving, hairy 
processes. Mesosternum and venter carinate down the 
middle. Sixth segment without carina, more thickly pilose 
than the fifth and more than twice as long. 
Holotype , no. 17024, M. C. Z. apterous male, and allotype, 
apterous female, Jamaica, near Troy, May 12, 1909, A. E. 
Wight, collector. Paratypes, 6 males and 8 females, taken 
with type. 
This species apparently is nearest related to G. carirtiven- 
tris Champion. Its color markings are somewhat variable. 
From cariniventris it may be recognized by the larger, 
more prominent tubercular dilations of the anterior femora 
and the more deeply excavated sixth segment of the venter 
in the male, and the strongly produced connexival apices in 
the female, 
Limnogonus guerini Lethierry and Severin 
Gerris marginatus Guerin, Icon. R. An. Ins., 1844, p. 351, 
pi. 57, fig. 2; in Sagra, Hist, de Cuba, Ins. 1857, p. 173. 
Limnogonus guerini Lethierry and Severin, Cat. Gen. 
Hem., Ill, 1894, p. 61. 
Many apterous and alate specimens : — Port Antonio, Ja- 
maica, Jan. 1, 1906, A. E. Wight; Grande Anse, Haiti, P. R. 
Uhler; St. Moore, Haiti, Jan. 1913, W. M. Mann; San Do- 
mingo, P. R. Uhler; Rio Bayamo, Cuba, Dr. Thomas Bar- 
bour; Bajo, Calif., one female, N. Banks. 
This species is widely distributed and is very common 
in the West Indies and Central America. Long series of 
specimens from Honduras, Guatemala and the islands of 
the West Indies show that there is variation in size and 
considerable modification in the color markings. The fe- 
male specimen from Baja, California, Collection of Nathan 
Banks, greatly extends the range of the species. The 
record indicates that the form from California described 
