68 
Psyche 
[June 
minal segments of the males and the color patterns are dif- 
ferent. H. smithi has a more slender genital segment as 
seen from above and parallel longitudinal white bands on 
the last abdominal and genital segments. These are lacking 
in H. poissoni. 
Described from two males labeled “Africa, Uganda, 60 
miles west of Kampala, March 4, 1948, F. X. Williams,” 
Holotype in the Museum of Comparative Zoology (No. 
28493) at Harvard, the paratype in the F. H. Snow Col- 
lection. Named in honor of Dr. Raymond Poisson who has 
described several Hydrometra from Africa. 
Hydrometra albolineolcita Reuter 
While the Hungerford and Evans paper of 1934 was in 
press, Dr. Jaczewski published his “Notes on the Aquatic 
Heteroptera of the Ethiopian Region” 2 in which he rede- 
scribed H. albolineolata Reuter and described as new a 
species which he called Hydrometra ugandae. 
His conception of Reuter’s species was based upon a male 
specimen from “Addah, Guinea,” loaned to him by Dr. 
Horvath of the Museum in Budapest and presumably a syn- 
type. However, I had previously studied the entire series 
of specimens in Budapest, two syntypes in the Museum at 
Perth, Scotland, and one in the U. S. National Museum at 
Washington, D. C., and my conception of the species (which 
differs from that of Dr. Jaczewski) is given on page 50 and 
Plate II of our 1934 paper. 
Being puzzled by the difference in concept concerning 
this species, I have studied the question again and re- 
examined material which forces me to conclude that my 
conception of Reuter’s species is the correct one. I am there- 
fore selecting a male syntype that corresponds to the figures 
on Plate II of the Annales Musei Nationalis Hungarici 
XXVIII, page 48, as the lectoholotype. 
1 have examined a pair of specimens determined as H. 
albolineolata by Dr. Jaczewski and the male labeled “Zanzi- 
bar, H. J. Snell” runs to H. africana H. & E. The female 
2 Stylops, Vol. 1, Part 5, pp. 100-104, 1932. 
