362 HEMIPTERA-HETEROPTERA. 
[Verh. zool.-bot. Ges. Wien, xxi. pp. 899-440 (1871)], who, however, does not figure 
any of them in that work. The species of Deinostoma (Serphus), Pedinocoris, Zaitha, 
Abedus, Belostoma, &c., carry their eggs about on their backs, glued together in a large 
flat mass on the elytra, and, according to Miss F. W. Slater (Amer. Nat. 1899, pp. 931- 
933), this operation is performed by the males only, the females compelling them to 
undertake the task. | 
Many of these insects have been attracted to light in large numbers, and the 
North-American species of Belostoma and Benacus appear to be known in the 
United States under the name of “electric light bugs.” In Kingsley’s ‘Standard 
Natural History,’ ii. pp. 255-261 (1884), Prof. Uhler has given an excellent account 
of the characters and habits of the North-American Belostomide, as well as of 
those of the Naucoride, &c. In addition to the species enumerated here, two others 
have been recorded from Mexico, but further evidence is required before they can be 
included in our list: these are Hydrocyrius columbia, Spin. (cf. Mayr, Verh. zool.-bot. 
Ges. Wien, xxi. p. 429), and Belostoma griseum, Say (cf. Walk. Cat. Heteropt. 
Hemipt. viii. p. 175). 
DEINOSTOMA. 
Serphus, Stal, Stett. ent. Zeit. 1862, p. 462; Mayr, Verh. zool.-bot. Ges. Wien, xxi. pp. 401 , 403 
(1871) (nomen preocc.). 
Deinostoma, Kirkaldy, Entom. 1897, p. 258. 
This genus is a very close ally of Pedinocorts and Abedus, differing from the former 
in having the metasternum keeled, and from the latter by the 3-jointed antenne and the 
entirely pubescent ventral surface of the abdomen. ‘The females of all these genera 
have two small, shallow, piligerous fovee * immediately before the apex of the sixth 
ventral segment, which is slightly truncate or feebly emarginate in this sex. ‘The 
males have the corresponding segment rounded at the apex and without fovee. 
1. Deinostoma dilatatum. (Tab. XXI. figg. 18, 2; 18a, antenna.) 
Belostoma dilatata, Say, Descr. New Spec. Heteropt. Hemipt. N. Am. (New Harmony, Dec. 1831)‘; 
Complete Writings, 1. p. 366°. 
Serphus dilatatus, Stal, Stett. ent. Zeit. 1862, p. 462°; Mayr, Verh. zool.-bot. Ges. Wien, xxi. 
p. 403*; Uhler, Bull. U.S. Geol. & Geogr. Surv. i. p. 338°; Proc. Calif. Acad. Sci. (2) iv. 
p. 292°. 
Hab. NortH America, California ®, Lower California °, Arizona ®.—Mexico > (Mus. 
Holm.?), Tacubaya and San Bartolo (Bélimek, in Mus. Vind. Ces.*), Puebla (Mus. Vind. 
— Ces.), between Vera Cruz and Jalapa (Bennett 12). 
We have not received a specimen of this insect from within our limits. Two females 
from Mexico, belonging to the Vienna Museum, have, however, been examined. 
* The presence of two small hairy papille in this sex has been noticed by Miss F. W. Slater (Amer. Nat. 
1899, p. 932) in both Deinostoma and Zaitha. 
