328 TERTIARY INSECTS OP NORTH AMERICA. 



markings of the tegmina are usually very distinct, especially those of the 

 inner margin, where the subapical spot is most conspicuous. Both basal 

 spots are present, but the scutellar much reduced and often obscure ; the 

 subbasal is always absent, as far as I have seen : of the median spots the 

 costo-median is never present, and the suturo-median generally obscure, 

 often removed away from the suture and frequently absent, while th 

 clavo-median is always present and generally distinct ; the subapical spot 

 of the costal margin is never more thau faintly indicated if present, and the 

 apical marginal band invariably absent. 



Length of body, 10 mm ; of tegniiua, 8 mm ; breadth of thorax, 3.5 ram . 



Named for the late Archibald Robertson Marvine, one of the active and 

 acute geologists of the Hayden Survey. 



Florissant. Eleven specimens, Nos. 1683, 3090, 3801, 4256, 4431, 

 5761, 6484, 8743, 9158 and 9254, 12978, 13578. 



4. PALECPHORA COMMUNIS. 

 PL 20, Figs. 3, 20, 21. 



This species is closely allied to the last, hardly differing from it except 

 in the obscurity, not always absolute, of the n eviration of the tegmina, 

 indicating a more coriaceous texture to the same. It is slightly smaller 

 as a rule, though some specimens are as large as many of P. marvinei. 

 The spots of the tegmina are also much the same as there, but though the 

 lower subapical spot is sometimes the only one which is conspicuous it 

 usually shares its distinction with all the others of the inner margin, while 

 rarely are any of those of the costal margin seen at all, except the basal 

 one, the costo-median being almost invariably absent and never conspicu- 

 ous, being wrongly represented as of much too deep a tint in Fig. 3 ; the 

 subbasal spot and apical band are never present, and the suturo-median spot 

 is never more than a faint cloud. 



Length of body, 9.25 ram ; of tegmina, 7.5 mm ; breadth of thorax, 3 mm . 



Florissant. Thirty-four specimens, Nos. 159, 2087, 4476, 4759, 5189, 

 5720, 5862, 5911, 5950, 6524, 6636, 7496, 8037, 8098, 8894, 8937, 8969, 

 9218, 10681, 11009, 11767, 12468, 12471, 12984, 13000, 13568, 13570, 

 13577, 13580, 13581, 13584, 14187, and of the Princeton Collection 1.320, 

 1.826 and 1.830. 



