308 NORTH AMERICAN TRYPETINA. 



found a special genus for this single form would be premature, 

 as there are several concurrent South American species, without 

 the knowledge of which it is difficult to choose the characters 

 upon which to establish the genus. To place the species in the 

 genus Eurosta is likewise unadvisable, as the absence of bristles 

 upon the third vein, and the not conical but flattened ovipositor 

 are in conflict with the chief characters of Eurosta. 



51. T. acqualis Loew. % ?. (Tab. X, f. 20.)— Dilute lutea, terebra 

 concolore, tribus ultimis abdominis segmentis simul s\imtis longiore, 

 pilis, setisque totius corporis exalbidis ; alae colore ex-fusco nigricante, 

 adversus costam et apicem in nigrum mutato, sequaliter guttato-reticu- 

 latae, guttis confertis plerisque majusculis, pictura marginis antice 

 radiata, marginis apicalis subradiata; vena longitudinalis tertia non 

 pilosa. 



Pale yellowish ; ovipositor of the female likewise yellow, longer than the 

 last three abdominal segments taken together ; pile and bristles of the 

 whole body whitish ; wings with a brownish-black guttate reticulation, 

 black near the anterior margin and the apex ; the drops are crowded 

 and the majority of them are of a considerable size ; the pattern of the 

 picture consists of rays along the anterior border, which are less well- 

 marked along the apex ; the third vein is not beset with bristles. 



' Long. corp. % 0.22, $ cum terebra 0.25—0.26 ; long. al. 0.24—0.25. 



Syn. Trypeta cequalis Loew, Monogr. etc., I, p. 86. Tab. II, f. 20. 



Hab. Illinois (Kennicott). [Maryland, P. R. TJhler ; Ohio, 

 H. F. Bassett— O. S.] 



Observation. — The present species shows such a peculiar 

 structure of the head and of the parts of the mouth, that I would 

 not have hesitated to establish a separate genus for it, if I had 

 had better preserved specimens for examination. The general 

 appearance reminds of the species which I have united in the 

 genus Icterica, but it differs in a smaller oral opening, a different 

 shape of the wings, and a third longitudinal vein which is not 

 beset with bristles. Not being able to assign a better position 

 for it at present, I had the choice of leaving it in the genus 

 Tephritis or of removing it to the genus Euaresta, proposed in 

 the second observation to Tryp. angustipennis. The choice is 

 not a very easy one, because, although the picture of the wings 

 is distinctly radiate along the anterior margin as far as the apex, 

 the apex itself and the space immediately behind it are more 

 guttate than radiate. By all means, the question is more about 



