42. ACHEEDOCEETJS. 43. DECAMEEIA. 93 



bulla ; a white line runs from the first submarginal cell, and forks 

 about the middle of the second, intersecting the remainder of 

 the submarginal and discoidal cells, and widely expanding in the 

 outer ones, without reaching the hind margin : hind wings with one 

 middle cell ; a simple white line runs above all the anal veins. Legs 

 slender, not very long ; tibiae with two short terminal spurs. 

 Allied to Decameria and to Perreyia. 



1. Acherdocerus fumipeimis. 



(Plate YIL fig. 1.) 



Exp. al. 6 lin., long. corp. 2| lin. 



Black, shining ; thorax, pectus, and undersurface of head reddish 

 testaceous ; legs pieceous, femora and hind legs darker ; wings 

 smoky brown. 



Hah. Mexico. 



a. 2 - Orizaba. M. Salle. 



43. DECAMERIA. 



Decameria, St.-Fargeau, Enc. Meth. x. p. 371 (1825). 

 Dictynna, Brulle {nee Westic), Hym. iv. p. 662 (1836). 



As St.-Fargeau characterized this genus very briefly, although 

 recognizably, and indicated no types, I have thought it necessary to 

 recharacterize it, taking testacea as the type. It differs from Acher- 

 docerus in its 10- jointed antennae, the want of an appendicular cell 

 on the fore wings, &c. 



Head small, narrow ; antennae 10-jointed, the first two joints 

 small, the third joint twice as long as the remainder, which are of 

 about equal length and obtusely expanded at the extremities. Pore 

 wings with the marginal cell broad, not appendiculate, and four sub- 

 marginal cells, the three first of nearly equal size, the first recurrent 

 nervure received between the first and second, and the second just 

 beyond the juncture of the second and third; lanceolate cell 

 petiolated, very small : hind wings with the marginal cell appen- 

 diculate, and with one inner cell. 



1. Decameria testacea. 



(Plate VII. fig. 2.) 



*Exp. al. 5J lin., long. corp. 2J lin. 



Testaceous ; head above the antennae, hind legs below the middle 

 of the femora, and the four last joints of the intermediate tarsi 

 black. "Wings hyaline with piceous nervures, tips and a broad 

 stripe across the centre dusky; stigma yellow, with a yellow 

 erescent below ; the whole of the first discoidal cell is covered by 

 the central dusky band (which extends within and below it), except 



