TWO NORTH AMERICAN SYRPHID/E 151 



Amastus diaphenes, new species. ' 



Head and thorax cinteriorly brown ; wings hyeJine, margins narrowly 

 brown ; back of thorax amd abdomen dorsally rose-crimson ; orbits, base 

 of palpi, pectus, and venter of thorax of the same red color ; venter of 

 abdomen brown. Expanse, 61 mm. 



Type, male. No. 18907, U. S. Nat. Mus.; Colombia (Schaus col- 

 lection, purchased from Staudinger). 



TWO NORTH AMERICAN SYRPHIDi« 



By FREX>ERICK KNAB 



Ocyptamus jactator (Loew). 



S^Tphus jactator Loew, Wien. Ent. Monatschr., vol. 5, p. 40 (1861); Berlin. 

 Ent. Zeitschr., vol. 9, p. 156 (Century VI. No. 46) (1865). 



The National Museum possesses a single specimen of this species, taken 

 at Biscayne Bay, Florida, by Mrs. A. T. Slosson. Like Loew's type, 

 it is a male and it agrees v^ath his description in every detail except one. 

 He indicates a broad yellow fascia at the base of the fourth abdominal 

 segment, as well as of the second and third segments. The specimen 

 before me has the fourth segment ferruginous, vnth a nsirrow median 

 blackish stripe. The difference, however, is merely due to the condition 

 of the specimen, decomposition of the body contents having destroyed 

 the pigment in that segment. With close scrutiny the location of the 

 yellow band may still be made out. The bright yellow scutellum and 

 abdominal fasciae suggest Syrphus, but the other characters are all typical 

 of Ocyptamus. The wong is smoky for the most part, only the second 

 basal cell and the region behind it being clear ; there is a yellowash shade 

 within the clouded portion, anteriorly beyond the middle. Loew described 

 the species from Cuba and its occurrence in Florida emphasizes the exist- 

 ence of a large Antillean element in the fauna of southern Florida. 



Syrphus diversifasciatus, new species. 



Male : Face prominent, yellow, descending eJmost perpendicularly, a 

 diffuse ferruginous mediem shade, heaviest on the tubercle amd about the 

 mouth, clothed with white pile except on the shining tubercle ; cheeks 

 black; frons ferruginous, broadly blackish along the eyes, clothed with 

 coarse black hair which extends well down at the sides of the antennae ; 

 vertex black ; occiput with whitish pile. Antennae ferruginous beneath, 



