CGELOPTEENA.— TANAOCERTJS. 191 



COELOPTERNA, Stfil. 

 Acrydium (in part.), De Geer. 



Paulinia, Blanchard, in D'Orbigny's Voy. dans FAmer. Merid. vi. 2, Ins. p. 216 (1837-43). 

 Coeloptema, St&l, Ofv. Vet.-Ak. Forh. xxx. 4, p. 53 (1873). 



The genus Coeloptema is confined to Tropical America, although it occurs in 

 Argentina along the valley of the Parana River nearly or quite to its mouth. The 

 members of this group live upon aquatic plants in a manner similar to many of 

 the Tettigiinse and some of the Acridiinse. In this semiaquatic life these insects 

 are no doubt obliged frequently to swim, hence the peculiar development of the hind 

 tibiae. Possibly Blanchard's name Paulinia should be used for this genus instead of 

 StaTs later one. 



1. Coelopterna acuminata, De Geer. 



Acrydium acuminatum, De Geer, Mem. Ins. iii. p. 501. 19, t. 42. fig. 10 (1773) \ 



Coelopterna acuminata, Stal, Recens. Orthopt. i. p. 145 (1873) 2 ; Giglio-Tos, Boll. Mus. Zool. 



Univ. Torino, ix. no. 184, p. 5 (1894) 3 ; xii. no. 301, p. 3 (1897) \ 

 Coelopterna acuminata, var. brevipennis, Giglio-Tos, loc. cit. ix. no. 184, p. 7 (1894) 5 . 

 Coelopterna stalii, Scudd. Proc. Bost. Soc. Nat. Hist. xvii. p. 277 (1875) 6 . 

 Paulinia mucosa, Blanch, in D'Orbigny's Voy. dans FAmer. Merid. vi. 2, Ins. p. 216, t. 27. 



fig.6 7 . 



Hah. Panama, Laguna Pita, Darien (Dr. E. Festa). — South Ameeica to Argentina. 



While spending some time in Argentina several years ago the writer collected 

 a number of individuals of this species in Rosario de Santa Fe, after nightfall, 

 where they had been attracted by the electric lights. It would appear, therefore, 

 that the insect is more or less nocturnal in its habits. 



[TANAOCERUS, gen. nov.* 



Size small, the body more or less verrucose or rugose, fusiform, neither depressed nor compressed ; pronotum 

 ample, higher than long, the hind margin not prolonged above, without lateral carinas, but with the 

 median carina strong. Abdomen strongly carinate. 



Head small, the face nearly vertical, occiput short ; eyes subspherical, fairly prominent, not quite so long as 

 the cheeks below ; vertex broadly and shallowly sulcate, nearly as broad as the diameter of one of the 

 eyes, not expanding anteriorly and bordered at the sides with rather coarse parallel carinas which 

 converge abruptly in front and continue as the carinas of the frontal costa; lateral foveohe nearly 

 obsolete ; ocelli contiguous to the eyes, small and inconspicuous ; frontal costa prominent above the 

 ocellus, obsolete below, or continued as a single inconspicuous carina to the clypeus ; lateral facial carinas 

 prominent, evenly divergent ; antennae composed of about 25 or 26 joints, very slender and elongate, the 

 basal and second joints unusually large and robust. Pronotum transversely rugose, short, high, without 

 lateral carinas, but with the median carina strong throughout; anterior edge very slightly advanced 

 upon the occiput, the posterior margin sinuately crenulate, but not prolonged to the rear. Meso- and 



* This genus was not included in the Synopsis, anted, pp. 114-119. 



