100 HEMIPTERA-HETEROPTERA. 
The specimen figured is in the Stockholm Museum, and was forwarded to me as a. 
typical specimen of E. westringit, Stal. I have compared the same with the type of 
Aceratodes privatus, and find both to be identical. Walker's name, therefore, takes 
_ precedence. 
OLBIA. 
Olbia, Stal, Stett. ent. Zeit. xxiii. p. 118 (1862) ; Ofv. Vet.-Ak. Férh. 1867, p. 582. 
Olbia differs principally and strikingly from the preceding genus in having the 
posterior angles of the pronotum acutely produced. 
Only two species of this genus are at present recorded, both Neotropical, one of which 
is included in this fauna. 
1. Olbia caprina. (Tab. X. fig. 4.) 
Olbia caprina, Stal, Stett. ent. Zeit. xxiii. p. 118. 115* ; En. Hem. ii. p. 61. 2”. 
Hab. Muxico1?; Braziu (coll. Signoret). 
The figure is from a typical specimen forwarded to me by Dr. Signoret. 
Subfam. ACANTHOSOMINAL. 
Acanthosomina, Stal, Hem. Africana, i. p. 83 (1864). 
Only one species of this subfamily having as yet been received or recorded from 
Central America, it is scarcely necessary to make much numerical comparison of either 
genera or species. Computing, however, in a general manner, according to present 
knowledge, the Acanthosomine of the Nearctic and Neotropical Regions comprise about 
three fourths the number of genera, and two fifths the number of species, of those 
recorded in the same subfamily from Africa, Asia, and Australia. 
ACANTHOSOMA. 
Acanthosoma, Curtis, Brit. Ent. i. p. 28 (1824) ; Dallas, List Hem. i. p. 198 (1851) ; Stal, En. Hem. 
v. p. 110. 
This genus being the only one known to represent the subfamily in Central America, 
the two-jointed tarsi, a character peculiar to the whole of the Acanthosomine, will at 
once distinguish it. It is common to the Nearctic, Palearctic, and Oriental Regions. 
Of the American species all are Nearctic, one of which, here enumerated, has also been 
received from Mexico. | 
It is of the European species A. griseum, Burm., that Westwood, quoting De Geer in 
his ‘ Mémoires,’ gave the interesting description of the females, accompanied by their 
respective broods, each consisting of from twenty to forty young, which they attended 
- with as much care as a hen does her brood of chickens. In this county Mr. Hellings, 
of Exeter, in 1871 (Ent. Month. Mag. vol. ix. p. 13) “ observed a female ona birch tree 
