252 NORTH AMERICAN TRYPETINA. 



only. In all other respects the agreement with T. obliqua is so 

 great, that I do not dare to decide whether this Brazilian Trypeta 

 is a distinct species or merely a variety of T. obliqua. It is not 

 to be confounded with another Brazilian species, which is con- 

 siderably larger, and of which I possess only the female. I let 

 its description follow : — 



T. biseriata n. sp. £>• — Trypetse obliquae Say, quam magnitudine 

 superat, simillima, sed capite proportioue majore, pilis totius corporis 

 longioribus, pleuris immaculatis, alis minus pure hyaliuis et cellula 

 basali secunda non hyalina, sed lutea distincta. 



Very like T. obliqua Say, but larger, witb a comparatively larger head, 

 longer pile ou the whole body and unspotted pleura ; wings of a less 

 pure hyaline; second basal cell not colorless, but yellow. Long. corp. 

 0.17—0.18; long. al. 0.22—0.23. 



Coloring aud picture of the body similar to the female of T. obliqua Say, 

 especially the two black dots upon the posterior portion of the thoracic 

 dorsum and the five black dots upon each side of the abdomen ; the black 

 dots which T. obliqua has on the posterior portion of the pleura? are 

 entirely wanting here. The pile on the whole body is much longer, black 

 upon the abdomen and especially striking upon the posterior edge of its 

 first segment. The head is proportionally larger. The wings are com- 

 paratively somewhat broader and their surface, especially towards the 

 posterior margin, is a little more dusky ; the first and third longitudinal 

 veins are beset with much longer bristles ; the venation agrees, in the 

 main, with that of T. obliqua; the picture of the wings also is very much 

 alike, only the dark portions of 1 it are less brownish-black and more 

 diluted ; the last two yellow bands are much less extensive ; the second 

 basal cell, which in T. obliqua is always hyaline, is altogether tinged with 

 clay-yellow here. The ovipositor is about as long as the last two abdo- 

 minal segments taken together, and is broadly truncate at the end. 



Ilab. Brazil. 



Observation 2. — Trypeta discolor and obliqua Say, as well as 

 the T. biseriata described in the preceding observation, are three 

 very closely resembling species, agreeing in all the principal 

 characters. They have no immediate relatives in Europe, with 

 which they could be placed in the same genus ; however, they 

 are somewhat allied to (Edaspis, as they have the direction of the 

 crossveins and the course of the second crossband, covering the 

 crossvcins, in common with that group ; in almost all the other 

 important characters they show striking differences. I propose, 

 therefore, the formation of a new genus for them, which I call Pla- 



