9° 
358 HEMIPTERA-HETEROPTERA. 
10. Ambrysus signoreti. (Tab. XXI. fig. 11, ¢.) 
Naucoris poeyi, Amyot et Serv. Hist. Nat. Hémipt. p. 434, t. 8. fig. 5 (nec Guér.) '. 
Ambrysus signoreti, Stal, Stett. ent. Zeit. 1862, p.460*; Enum. Hemipt. v. p. 143°; Mont. Verh. 
zool.-bot. Ges. Wien, 1897, pp. 18, 23‘; Uhler, in Kingsley’s Stand. Nat. Hist. ii. p. 260, 
fig. 319°; Proc. Calif. Acad. Sci. (2) iv. p. 291°. 
Hab. Norta America, Upper and Lower California ®, Arizona 5®,— Mexico 1-5 
(Mus. Holm. & Vind. Cas. ; Sallé). 
We have a single male example of this insect from Mexico (Sallé), without definite 
locality. It is easily recognizable by its peculiar coloration. ‘The posterior angles of 
the connexival segments 2-5 are acutely produced. Prof. Uhler® states that this 
species is to be found in the best-watered parts of Arizona and Mexico, dwelling in 
the quiet waters adjacent to streams and in standing pools, especially such as are 
grassy. . 
Subfam. LIMNOCORINA. 
LIMNOCORIS. 
Limnocoris, Stal, Rio Jan. Hemipt. i. p. 83 (1860) ; Hemipt. Afric. iii. p. 175; Enum. Hemipt. v. 
pp. 142, 145; Montandon, Boll. Mus. Zool. ed Anat. comp. Univ. Torino, xii. no. 297, p. 3; 
Verh. zool.-bot. Ges. Wien, 1898, p. 414. | 
Borborocoris, Stal, Ofv. Vet.-Ak. Férh. xviii. p. 202; Enum. Hemipt. v. pp. 142, 146. 
This American genus includes eighteen described species, four of which are from 
within our limits, whence one other is now added, the remainder being from South 
America. In the males the fifth ventral segment is freely movable, it being divided 
longitudinally into three pieces, and two genital segments are visible. In the females 
the fifth ventral segment is entire and one genital segment only is visible. In the new 
species described below, L. insularis, the eyes are not margined at their outer angle 
and the suture between the clavus and corium is very indistinct. ‘The meso- and 
metasternal caring, as noted by Montandon, are concave and flexible at the summit, so 
as to enable the insects to cling to stones, &c., in the rapid streams, and they differ in 
form according to the species. The species of Zimnocoris are fully tabulated by 
Montandon in the above-quoted papers. 
1, Limnocoris stali. (Tab. XXI. fig. 12, 2.) 
Borborocoris profundus,, Stal, Stett. ent. Zeit. 1862, p. 461 ' (nec Say). 
Limnocoris profundus, Stal, Enum. Hemipt. v. p. 145 *. 
Limnocoris stali, Mont. Boll. Mus. Zool. ed Anat. comp. Univ. Torino, xii. no. 297, p. 4 (1897) °; 
Verh. zool.-bot. Ges. Wien, 1898, p. 415 *. 
Hab. Guatemata (Mus. Vind. Ces.?)—CotomBia*®; Vunezveta??; Borivia 3. 
One of the Guatemalan specimens of this species described by Montandon, and 
