CRYPHOCRICUS.—AMBRYSUS. 355 
1. Cryphocricus macrocephalus. (Tab. XXI. figg. 2, 2a, 2; 2, antenna.) 
Cryphocricus macrocephalus, Mont. Bull. Mus. Paris, 1897, p. 124 ‘ 
Hab. Mexico, Cuernavaca in Morelos (H. H. Smith); Guatemata, Alta Vera Paz 
(Bocourt, in Mus. Paris.'). 
Of this curious species we have received a single female example from Mexico. ‘The 
type appears to be of the same sex. 
AMBRYSUS. 
Ambrysus, Stal, Stett. ent. Zeit. 1862, p. 459; Hemipt. Afric. iii. p. 174; Enum. Hemipt. v. 
pp. 141, 143 ; Montandon, Verh. zool.-bot. Ges: Wien, 1897, pp. 6, 11; Bull. Mus. Paris, 
1897, pp. 129, 130. 
An American genus, including eighteen described species, no fewer than ten of 
which are from within our limits. Five only are represented in our collection, and 
three of these by single specimens. The sexual characters are similar to those of 
Limnocoris. Ambrysus is nearly allied to that genus, from which it chiefly differs in 
having the interocular portion of the head narrowing forwards (instead of backwards), 
and in the absence of the meso- and metasternal elevations, the various species no 
doubt living in more stagnant waters. ‘The pronotum is deeply excavate in front for 
the reception of the head in both Amérysus and Limnocoris, a character separating 
these genera at once from Pelocoris. Naucoris profunda, Say *, the type of which was 
taken by Bennett in Mexico, probably belongs to this genus (and not to Limnocoris, 
as supposed by Stal); it cannot be identified with certainty from the description. 
Montandon has fully tabulated all the species of Ambrysus in the above-quoted papers. 
1. Ambrysus geayi. 
Ambrysus geayi, Mont. Bull. Mus. Paris, 1897, pp. 128, 130°. 
Hab. Panama, Darien (Geay, in Mus. Paris.1). 
This species is a close ally of A. oblongulus, from which it is stated to differ in having 
the posterior angles of the pronotum more truncated and the anterior angles more 
acute, the posterior angles of the connexival segments more produced, the scutellum 
dark at the apex, &c. 
2, Ambrysus oblongulus. (Tab. XXI. fig. 3, 3.) 
Ambrysus oblongulus, Mont. Verh. zool.-bot. Ges. Wien, 1897, pp. 11, 14°. 
Hab. Costa Rica, Talamanca (Bovallius, in Mus. Holm.!); Panama, Taboga I. 
(Champion). 
* Descr. n. sp. Heteropt. Hemipt. N. Am. (New Harmony, Dec. 1831) ; Complete Writings, i. p. 363. 
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