1885.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM, 121 



Name. 



* Dioncla episcopa' 



* Dioiifla sereua^ 



* Dionda texeusis^ 



Dionda papalis 



* Dionda argentosa* 



t Dionda cbrysitis " 



t Dionda melanops ^ 



*■ Dionda couchi . 



Dionda plnmbea 



Dionda spadicea 



Dionda grisea, (U. S. Pac. R. K.).. 



* Hyborliynclius perspicuus 



* Hyborbynchus tenellns 



Hyborbyncbus punicens 



* Hyborby ncbns confertus 



* Pi mephales macnlosna 



Pinicpbales fasciatua 



* Algoma amara 



Algoma tinviatilis 



* Cocbloguatbus ornatns, (B. & G.). 



* Hybognatbns argy litis 



Hybognatbns evansi 



* Hybognatbns placitus 



* Aigansea bicolor 



* Aigansea obesa 



* Aigansea formosa ' 



* Lavinia exilicanda, (B. & G.) 



* Lavinia bareugns 



■* Argyrens dnlcis. 



Identification. 



Dionda epiacopa, (Grd.). 



Dionda seven a, (Grd.). 



Dionda e])isei)pai, (Grd.). 

 ? Dionda serena, (Grd.). 



Dionda episeopa, (Grd. ). 



Dionda serena, (Grd.). 



Dionda melanops, (Grd.). 

 ? Dionda melanops, (Grd.). 

 ? Zopbenduin fplumbenm, (Grd.). 

 FZophendnm fpliimbenm, (Grd.). 

 ? Zopbendnm fplumbenm, (Grd.). 



Pimepbales notatns, (Raf.). 



Pimcpbales notatns, (Raf.). 

 ? Zopbendnm fplnmbenm, (Grd.). 



Pimepbales pronielas eonfertus, (Grd.). 



Pimepbales promelas confertns, (Grd.), 



Pimepbales promelas, (Raf.). 



Dionda amara, (Grd.). 



Dionda tinviatilis, (Grd.). 



Cocbloguatbus ornatns, (B. & G.). 



Hybognatbns argyritis, (Grd.). 

 ? Hybognatbns nncbalis, (Agass.). 



Hybognatbns unebalis placita, (Grd.). 



Aigansea bicolor, (Grd.). 



Aigansea obesa, (Grd.). 



Aigansea symmetrica. (B. «fe G.). 



Lavinia exilicanda, (B. & G. ). 



Lavinia exilicanda, (B. & G.). 



Rbinicbtbys cataractse dnlcis, (Grd.). 



Agosia nubila, (Grd.). 



Argyreus nubilus ^ 



1 Tbis species bas been lately fairly described by Professor Cope, nnder tbe name 

 of Hytognathus flavipinrm. Tbe snborbital bones in tbis and otber species of "Dionda" 

 are ratbcr broad, mncb as in Hijbognatlius vuchaUs. Lat. 1. 37. 



* Tbis species bas been described nnder tbe name of Hyhoynaihus nigrotceniatus 

 Cope. It bas larger scales than D. episeopa, and ratber smaller eye. Lat. 1. 34. 



■' This species seems to be identical witb D. episeopa. Lat. 1. 36 to 39. 



■• Tbis species seems to be also identical witb D. episeopa. Lat. 1. 37. 



^Tbe types of Dionda serena and D. chri/sitis mncb resemble eacb other, except 

 that D. 8e)-ena is much darker in color. D. chrysitis has scales 5-32-4. Head 4f in 

 length ; depth 4^. Eye 3^^ in head. Head shorter and body less deep than shown in 

 Girard's figure. (Meek.) 



6 Z). melanops and D. eouchi are little ditferent. The former bas scales 7-38-4 ; the 

 latter (3-36-3. Both are deeper than the other Dionda'. ; depth 3| to 3f in length. In 

 D. couchi the lower jaw bas a consi)icuons dermal fold. Tbis is little developed in Z). 

 melanops and obsolete in tbe otber Dionda':. The black caudal spot is mncb more dis- 

 tinct in D. melanops than in D. couchi. (Meek.) 



'The original type of Fogonichthys symmetricus, B. & G., bas no barbel, and the teeth 

 are 4-5. Lat. 1.53. Depth 4^ in length. It seems to be identical with Aigansea 

 formosa. The name Aigansea should apparently supersede Leucos (preoccuiiied) and 

 Myloleueus, Aigansea antica, Cope (type examined by me) seems to be a valid species 

 of tbis genus. The following notes may be added to Cope's description : 



Head 3f in length ; depth 3^. Head acute, subcouic ; snout rather pointed, 4f in 

 head. Insertion of dorsal midway between pupil and base of caudal. Month small ; 

 jawsequal; maxillary 4 in head. Pectoral short, not nearly reaching ventral. Lateral 

 line decurved. Scales 10-49-6. Teeth 4-5, little booked, witb very broad grinding 

 surface. 



^'I am unable to separate Apocope vulnerata, henshavii, rhinichthyoidis, oveouesi from 

 A. nuhila. A. oscula, Cope (not Grd.), is also tbe same, as is probably Apocope carring- 

 toni also. The genus Apocope may apparently, without violence, be united to Agosia. 



