of the Amazon Valley. 271 



especially vary mucli in relative position. In speci- 

 mens which agree with the type of Olivier^ the third spot 

 is far from reaching the level of the apex of the second. 

 I find this character only in specimens from Cayenne, 

 Pard, and South Brazil; but the South Brazilian differ 

 in other points, and perhaps merit specific separation. 

 In other examples, the third spot at its base is nearly or 

 quite level with the apex of the second. This form occurs 

 with the type at Parii, and is the prevalent form on the 

 Upper Amazons. Lastly, examples occur in which the 

 third spot is so much advanced, that it is parallel with 

 the second for about one-fourth their respective lengths. 

 Such examples are furnished by Venezuela and the 

 Upper Amazons. These approach in the position of the 

 spots E. longipilis and the allied species, but E. sex- 

 inaetdata is a larger and more robust insect 3 and besides, 

 I have not yet seen specimens in which the posterior 

 spots are quite contiguous.* 



Sub-fam. Sph^riin^. 



Genus Nyssicus. 



Pascoe, Trans. Ent. Soc, 2 ser., v. 17; Lacord. Gen. 

 viii. 314. 



1. Nyssicus quadrinus, n. sp. 



Minus elongatus, depressus, testaceo-fulvus, nudus ; 

 capite crebre punctate ; thorace lateribus breviter obtuse 

 tuberculato, supra inaequali plagiatim punctulato, linea 

 mediana elevata, macula nigra apud marginem anticum, 

 altera ad marginem posticum; elytris apice unispinosis, 

 angulo suturali nullo, supra sparsim setosis punctulatis 



* The following may be added to the now numerous list of species of 

 this genus : — 



Ehurodacrys arcifera, n. sp. 



Elongata, gracilis, depressa, fulvo-testacea ; thorace elongato, trans- 

 versim punctato-rugoso, linea dorsali Ifevi, spina minuta laterali ; elytris 

 apice truneatis, spina laterali elongata obUqua nigra, suturali minuta 

 fulva, supra punctatis nitidis, sparsim longe pilosis, linea eburnea recta 

 basali, alteris duabus longioribus pone medium, interior! recta, exteriori 

 duplo longiori, arcuata ; femoribus elongatis gradatim incrassatis, inter- 

 mediis et posticis spina longa nigra armatis. 



Long. 8 Hn. (? . 



Hah. — Santa Fe, Minas Geraes. A Dom. Rogers capta. 



