524. Mr. F. Smith’s Descriptions of 
ferrugimous. ‘Thorax: rounded anteriorly, gradually nar- 
rowed posteriorly ; the posterior margin of the metathorax 
deeply emarginate ; the sides armed with six teeth; the 
apical half of the femora rufo-testaceous, as well as the 
tibize and claw-joint of the tarsi. Abdomen; the margins 
broadly rufo-testaceous ; the nodes of the peduncle with a 
bent spine on each side, 
Hab. Amazon. 
This most closely resembles the worker of C. minutus, 
but the form of the metathorax will at once show that it 
is a very distimct species; I have only seen a single 
specimen, which is in the collection of W. Wilson 
Saunders, Esq. 
2. Cryptocerus exiguus, n.sp. (Pl. XX VI. fig. 4.) 
C. ater, thorace subspinoso postice bispimoso, capite 
ante oculos utrinque testaceo. 
Worker. Length, 14 line. Black; the head and 
thorax with shallow punctures, the punctures having each 
a silvery white seta ; the margins of the head, before the 
eyes, pale testaceous; the antenne pale ferrugimous. 
Thorax: the anterior margin rounded ; the sides narrowed 
to the metathorax, with two short spines anteriorly ; the 
metathorax with a short spine on each side at the base, and 
a longer curved one at the apical angles; the tips of the 
femora, the tibie, and the tarsi, ferruginous. Abdomen 
ovate, the margin, at the base, slightly pale ; the nodes 
of the peduncle with a short spine on each side. 
This species also resembles CU. minutus, but a reference 
to the figure will show the difference in the form of the 
head and the nodes of the peduncle. 
Hab. Mexico. 
In the collection of W. Wilson Saunders, Hsq. 
3. Oryptocerus scutulatus,n. sp. (Pl. XXVI. fig. 3,3 a.) 
C. rufo-testaceus, capite thoraceque punctatis, abdomine 
brunneo-maculato. 
Worker. Length, 24 limes. Rufo-testaceous; head 
wider than the thorax, the margins raised, dish-shaped 
above ; the margins pale and crenulated ; the disk with 
scattered punctures, in each of which is a mmute shining 
seta. Thorax arched anteriorly, and having a short tooth 
in the middle of the sides, which narrow considerably 
