S4 Mr. C. H. T. Townsend on Dlptera 



being neglecta, Will. It is equally cartain that Fabrlcius's 

 name stylata must be dropped for the present, from the utter 

 uncertainty as to what his species was, since the relative 

 length of the antennal joints is not mentioned in his descrip- 

 tion, and the antennae are apparently absent in the type, 

 while it is known that the abdomen is wanting. Thus it 

 w'ould be futile for me to attempt to define it in the synoptic 

 table of species given below. It is barely possible that an 

 examination of the type, though so badly mutilated, might 

 place it, providing it could be found. Judging from 

 Fabricius's description, I believe it possible that his species 

 stylata may be distinct from any described, including those 

 in this paper. 



In the light of ray material, I am inclined to think that 

 the male specimen described by Dr. Williston as hiannulata, 

 Say (Trans. Conn. Acad. 1883, p. 7), is distinct from that 

 species, as the descriptions differ on the colouring of the 

 front in a way that can hardly be mistaken, especially since 

 the fifty-one specimens of my three species show absolutely 

 no variation in this regard. 



Synojjfic ialle of the American sjyecies of Stylogaster 

 so far known. 



1. Second autenual joint short, aljout as long as broad, 



tliird joiut strongly elongate net/lccta, Will. 



Second joint elongate, nearly or quite as long as 

 the third 2. 



2. Mesoscutum with the lateral borders broadly ]iale 



3'ello\v, rarely indistinctly so ; front riii'ous 



yellow anteriorly 3. 



Mesoscutum with only the humeri pale yellow, front 

 wholly without yellow anteriorly 4. 



3. Abdomen with a distinct median vitta (rarely sub- 



obsolete), widened into a triangle on base of 



second segment sti/tosn, sp. n. 



Abdomen without such vitta hiannulata, Say. 



4. Large species with prevailing colour blackish, hind 



tibiae and ovipositor conspicuously silvery white 

 before tips, silvery of face extending on sides of 



anterior half of front cthiopa, sp. n. 



Small species witiiout white on hind tibire or ovi- 

 positor, and with front wholly blackish or brown 

 to antennal pit ' 7iunuta, sp. n. 



11. Stylogaster stylosa^ sp. n. 



Eight female, and sis male si)eclmens. 



(J ? . Length of female nearly 5 to over 6 millini., not in- 

 cluding ovipositor, which is 2^ to 3 millim. Length of male 

 C^ to 8 millim. 



Very similar to S, In'annulata, Say, as shown by Say's 



