THYEEODON. 



289 



and apex) of T. morio, Fabr., and T. gracilis, Cresson, but it is probably distinct from 

 either. The face is deeply punctured, the hollow over the antennae bears some large, 

 curved, transverse striations ; the vertex is almost impunctate ; the eyes are distinctly 

 margined ; the fovea at the side of the clypeus is longish and deep ; the mandibles and 

 palpi are covered with long brownish hair ; the head is closely covered with black hair. 

 The upper side of the thorax is opaque ; the mesopleurae impunctate and shining ; the 

 mesonotum is closely and distinctly punctured all over, the inner sides of the furrows 

 rugose and raised ; the scutellum is shining, and punctured, but not closely ; the keels 

 in front of the scutellum are coarsely striated, the hollows behind it being also strongly 

 striated ; the metathorax is opaque, depressed at the base, bulging out somewhat at 

 the sides, hollowed in the centre behind, the hollow widest at the apex ; the mesonotum 

 is very closely and transversely, the pleurae more strongly and longitudinally, striated. 



Length 32 millim. 



T. grandis, Cresson, differs from this species in having the mesothorax " very minutely 

 and indistinctly punctured," the furrows on the mesonotum having a carina down 

 the middle, and in the scutellum being densely punctured. In T. erythrocera the 

 body is deep black, without either blue or green tints ; the anterior femora inclining to 

 piceous in tint. The specific distinctions between T. grandis, Cresson, T. cyaneus, 

 Brulle, and T. erythrocera can only be satisfactorily made out by an examination of 

 typical specimens. 



3. Thyreodon morosus. 



Thyreodon morosus, F. Smith, Descr. of New Species of Hymen, p. 230 ( ? ) \ 

 Hab. Costa Eica, Cache (Sogers x ). 



This species is readily known from T. erythrocera &c. by the antennae being whitish 

 yellow, not fulvous ; by the face being more strongly punctured, and with the two 

 longitudinal furrows much more distinct ; and by the scutellum being more gibbous 

 and strongly punctured. 



4. Thyreodon maculipennis. 



Thyreodon maculipennis, Cresson, Proc. Acad. Phil. 1873, p. 375 ( <$ $ ) \ 

 Hab. Mexico, Orizaba, Cordova (Sumichrast l ). 



5. Thyreodon laticinctus. (Tab. XII. fig. 14.) 



Thyreodon laticinctus, Cresson, Proc. Acad. Phil. 1873, p. 376 ( ? ) \ 

 Thyreodon principalis, F. Smith, Descr. of New Species of Hymen, p. 230 ( ? ) 3 . 



Hab. Mexico, Orizaba (Sumichrast l ) ; Guatemala, Zapote, Senahu (Champion) ; 

 Costa Eica, Irazu, Cache (Bogers 2 ). 



Apparently a common and widely distributed species. , 

 biol. CENTE.-AMEK., Hymenopt, June 1886. 2 pp 



