250 NORTH AMERICAN TRYPETINA. 



with the knowledge we have of the character of Macquart's pub- 

 lications, we cannot but suspect that his species is after all nothing 

 but the one we have described above. The position and direction 

 of the crossveins, as well as the general pattern of the picture of 

 the wings, distinctly show a certain analogy to T. sarcinata. The 

 synonymy cannot be assumed as certain, as Macquart, in his 

 description, does not mention either the black dots on the thoracic 

 dorsum, or the black coloring and the very striking shape of the 

 scutellum of T. sarcinata; moreover his figure of the wing shows 

 important discrepancies in outline, venation, and picture. By 

 all means, should even the identity of those species be confirmed, 

 Macquart's name would be lost for it, as it has been preoccupied 

 by Meigen. 



Observation 2. The great approximation of the crossveins and 

 their oblique position indicate the relationship of the present 

 species with (Edaspis. It differs, however, in the peculiar shape 

 of the scutellum, the greater length of the wings, and the shape 

 of the discal cell, which is more attenuated towards the basis. 

 The pattern of the picture of the wings differs from that of the 

 European and American species, as far as they are known. For 

 this reason, I do not think that it would be well placed in the 

 genus (Edaspis, and I propose for it the formation of a new genus. 

 Peronyma. The position and direction of the crossveins, as well 

 as the picture of the wings (the second crossband of which, as in 

 (Edaspis, incloses both crossveins), remind of Trypeta obliqua 

 Say and the species related to it; however, the structure of these 

 latter species has too little in common with T. sarcinata to allow 

 their juxtaposition in the same genus. 



16. T. discolor Lw. $. (Tab. X, f. 1.) Lutea, abdomine nigro, 

 alarum fasciis quatuor obliquis fuscanis, prinia et secunda antice, tertia 

 et quarta postice connexis, vena lougitudiuali tertia setosa, venisque 

 transversis valde approximatis. 



Clay-yellow, with a black abdomen ; wings with four oblique infuscated 

 bands, the first and second of which are connected anteriorly, the third 

 and fourth posteriorly ; the third longitudinal vein is beset with bristles ; 

 crossveius very much approximated. Long. corp. 0.13 ; long. al. 0.15. 



SYN. Trypeta discolor LOEW, Monogr., I, p. 64. Tab. II, f. 1. 



Hab. Cuba. 



This pretty species is so closely allied to T. obliqua Say, that 



