110 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



PELECOCERA.* 



Pelecocera Mfiigen, Syst. Beschr., iii, 340, 1822. 



Euceratomyia Willistou (nou Bigot;, Wiener Entom. Zeit., iii, 185, 1884. 



Small, uearly bare, blatik species, the sides of the face, and the abdo- 

 men, with yellowisli markings. Head broader than the thorax; front 

 of the male very broad, not narrowed above. Eyes bare. Face bare, 

 lightly concave above, moderately produced downward, and with a 

 large convex gibbosity l)elow. AntennjB large, first two joints very 

 short, third joint very much elongated, compressed, strongly dilated 

 below at the base, the terminal portion slender, cylindrical, ending in a 

 short, thickened, two-jointed, pubescent style. Abdomen of nearly 

 equal width, depressed, about as broad as the thorax; hypopygium 

 small. Feet simple, the femora not thickened. Marginal cell of wings 

 open, third longitudinal vein gently convex in front ; anterior cross- 

 vein near base of discal cell, rectangular. Type of genus P. tricincta 

 Meigen, Europe. 



This definition is drawn from specimens of P. Pergmidei, but it only 

 requires slight modifications to adapt it to the four other known, Euro- 

 pean species, specimens of two of which {P. latifrons Loew and P. scae- 

 voides Fall.) I have compared, through the kindness of Professor Mik. 

 In P. latifrons the structure of the antennae is very nearly like what it 

 appears to be in the female of P. Pergandei, except that the style is much 

 more slender ; the face is also more protuberant below. P. scaevoides 

 differs distinctly in the third joint of the antennae being more oval, and in 

 the style being more slender and dorsal, not terminal. P. Pergandei is thus 

 nearest allied to P. latifrons of any of the described species, and cannot 

 be sei)arated. The genus I first described as Euceratomyia^ overlooking 

 Pelecocera, and it was not till I casually read the description of Loew's 

 species that I recognized the relationship of my specimen, Mr. Bigot's 

 determination of the species, from my descrii)tions, as a member of the 

 genus Merapioides is of course wholly inadmissible. 



Pelecocera Pergandei. (Plate IV, fig. 13.) 



Euceratomyia Pergandei Willlston, Wien. Ent. Zeit., iii, p. 186, fig. 

 Merapioidcii Pergandei Bi.;j;ot, Wieii. Ent. Zeit., iii, 217. 

 Pelecocera Pergandei Williston, Bull. Brooklyn Ent. Soc, vii, 139. 



Hahitat. — District of Columbia ! 



^ . Length, 7™™. Head black ; face yellow, with a broad median 

 stripe, narrowed somewhat above, and the cheeks, shining black; an- 

 tennae reddish yellow, the upper border and the tip of the third joint 

 and the style hlackish. Front shining black, very broad , lightly grooved 

 across the middle. Thorax shining greenish black, on the humeri a 

 spot of whitish dust, extending back nearly to the root of the wings. 

 Abdomen scarcely broader than the thorax, a little broader at the tip 



"n^AcKVc, an axe ; Kipag, Lorn. 



