356 HEMIPTERA-HETEROPTERA. 
In this insect the head is very deeply sunk into the pronotum, the margins of the 
latter are faintly crenulated (when seen under a strong lens), and the surface of 
the head and pronotum is finely and densely granulated. The type, communicated 
by Dr Aurivillius,is a female. The two specimens (¢ and 9 ) found by myself on the 
Island of Taboga are a little smaller. The posterior angles of tie connexival segments 
3-5 are acute in both sexes. The body is much flattened, as in A. geayi. 
3. Ambrysus pulchellius. (Tab. XXI. figg. 4,4; 4a, antenna.) 
Ambrysus pulchellus, Mont. Verh. zool.-bot. Ges. Wien, 1897, pp. 11, 16°. 
Hab. GuatemMata (Mus. Hamburg.1), Paso Antonio, San Gerdénimo, Guatemala city 
(Champion). 
Of this species we possess six specimens, including both sexes. ‘The males differ 
from the females in having the posterior angles of the fourth and fifth connexival 
segments more acute and somewhat produced. These examples differ from the 
description in having a few fine scattered punctures towards the anterior angles of 
the pronotum, and the disc slightly depressed and finely, transversely wrinkled. 
From A. pudicus, Stal, it may be known by its more oblong shape and the much 
broader head. 
4. Ambrysus pudicus. (Tab. XXI. fig. 5, ¢.) 
Ambrysus pudicus, Stal, Stett. ent. Zeit. 1862, p. 460°; Enum. Hemipt. v. p. 143%; Mont. Verh. 
. zool.-bot. Ges. Wien, 1897, pp. 12, 17°. 
? Ambrysus pudicus, Uhler, Proc. Calif. Acad. Sci. (2) iv. p. 291 *. 
Hab. Nortu America, Upper and Lower California 4—Mexico!—3 (Mus. Holm. & 
Mus. Vind. Ces.). 
A male from the Stockholm Museum is figured. 
6. Ambrysus parviceps. (Tab. XXI. fig. 6, 2.) 
Ambrysus parviceps, Mont. Verh. zool.-bot. Ges. Wien, 1897, pp. 12, 17°. 
Hab. Mexico (Mus. Vind. Ces.', Saldé). 
We have a single example of this species, a female, like the type, which is now 
before me. Both have some scattered rather coarse punctures on the pronotum 
towards the sides and the disc transversely wrinkled in the centre in front. 
A. parviceps differs from A. pudicus in the relatively narrower interocular portion 
of the head, the rounded and more dilated sides of the pronotum, and the acuminately 
produced posterior angles of the connexival segments. The type is figured. 
