



HYPERIDEA. ggj 



Pedes 2di saepiusque lmi subprehensiles, manibus multum imperfectis, articulo 



4to ad apicem inferiorem paulo producto tantum. 

 G. 4. Metcecus, Krdyer. — Hyperion affinis. Pedes lmi 2dique perbreves, manibus 



melioribus didactylis bene confecti. 

 G. 5. Tauria, Dana. — Antennse ac in Byperid. Pedes 2di non prehensiles, arti- 

 culo 4to apice inferiore non expanso nee producto ; 7mi vix abbreviati. 

 G-. 6. Cyllopus, Dana. Taurice affinis. Pedes 7mi valde abbreviati vel rudi- 



mentarii. Antennae lmae et 2dae ad basin inter se remotse. 

 G-. 7. Daira, Edw. — Antennae lmae non conspicuae, 2dae exsertae. Pedes lmi 



2dique plus minusve prehensiles: tarsi pedum reliquorum breves. Rami sty- 



lorum caudalium longi. 

 G. 8. Cystisoma, Guirin* — Antennis pedibusque lmis Dairai affine. Tarsi prae- 



longi. Styli caudales longi, ramis brevibus. 



Subfam. 3. SYNOPIN^E. — Corpus gracilius. Palpus mandibularis 

 sat brevis, latissimus. Oculi grandes. 



G-. 1. Synopia, Dana. — Caput subtriangulatum, non oblongum. Pigmentum ocu- 

 lorum unicum. Pedes lmi parvuli, prehensiles, 2di setis longiusculis confecti; 

 4ti subprehensiles ; 5ti 6ti 7mique subasqui. 



Subfamily HYPEEIN.^. 



The large head, in this group, covered with facets and often nearly 

 filled with the pigments of the eyes, give a wild aspect to the species, 

 which is further enhanced by their ordinary attitude and motions — 

 the head inclining downward upon the anterior legs, and the animal 

 swimming with a diving motion and with great rapidity. 



Genus LESTRIGONUS, Edwards. 



The thorax in this genus is short and tumid ; often the first seg- 

 ment is more or less concealed, and the following two or three are 

 quite short. The head is large and rounded, but usually obliquely 

 truncated in front, about the base of the antennae. Nearly the whole 

 is covered with hexagonal facets, and the pigment constitutes a large 



* Guerin, Rev. Zool., i. 1842, p. 214. The species C. neptunus is three and half 

 inches long. 



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