34 IOWA STUDIES IN NATURAL HISTORY 
is to be placed on it for differentiation; it is given only to complete the 
picture.) 
Dimensions: Total length without appendages, 29.9 mm. 
Greatest width, 14 mm. 
Head: Long, 3.5 mm., wide, 6 mm., including eyes. 
Prothorax: Long, 5.4 mm.; wide, at apex 5.8 mm., at base, 10 mm. 
Scutellum: Long, 5 mm.; wide, 6.5 mm. 
Abdomen, frem apex of scutellum: Long, 16 mm.; wide, at widest part, 
14 mm. 
Note that the lengths are given with the parts of the bug in 
natural position; that is, head up, prothorax set back till its 
posterior edge is on groove in scutellum. The total length is 
derived by adding together the lengths of the head, thorax, 
scutellum, and abdomen from apex of scutellum. Much con- 
fusion in water bugs has arisen from neglect of this precaution. 
In the killing bottle many insects curl somewhat, or exsert 
parts habitually concealed; thus making a long collum or ver- 
tex; or lengthening or shortening some body segment. 
Type: 1 male Antigua, June 28, 1918, Stoner, in collection 
of the University of Iowa. There are also 4 nymphs, one about 
the second stage, and the others about the fourth or fifth. 
This species somewhat resembles Belostoma fuscipes Latr., but 
does not seem to belong to any of the species described of late 
years by Montandon. It is therefore described as new. 
Family Naucoride 
Pelocoris femoratus Pal. Beauv. 
So far as descriptions and published distribution go, this is 
our common North American form. It is accordingly given as 
such. It has heretofore been recorded from Guadeloupe and 
other West Indian Islands. There are nine adults and eighteen 
nymphs in all stages from Antigua, June 28 and July 28, 1918. 
Family Notonectide 
Notonecta indica Linné 
Two adults, one melanie, (June 28), and the other with the 
usual black membrane, (July 6), and also 3 nymphs, all from 
Antigua, are in the lot. The species has been recorded from 
Cuba only in the Antilles. 
