OF WASHINGTON, VOLUME XVI, 1914 



89 



DESCRIPTION OF A NEW SPECIES OF AGROMYZA FROM PORTO 



RICO. 



BY J. R. MALLOCH. 

 Agromyza insequalis n. sp. 



Mole: Black. Frons opaque, brown-black on center stripe, shining- 

 black on frontal triangle and orbits, the former subtriangular and n<.t reach- 

 ing to middle of frons; viewed from the side the frontal stripe shows slighl 

 signs of whitish pollen; the frontal lunule is distinctly white pollinose as 

 seen from above; antennae black, arista concolorous; proboscis yell.. \\ Hi 

 at apex, palpi black; cheeks black; mesonotum rather glossy black, with a 

 slight bluish tinge; pleurae and scutellum concolorous, the former very 

 slightly whitish pollinose. Abdomen glossy black, with a very decided blue- 

 green luster. Legs wholly black. Squamae whitish yellow, fringe concolor- 

 ous. Wings clear, veins black. Halteres whitish yellow, the stalk yellow. 



Fig. 1. Agromyza incequalis n. sp. 



Frons slightly over one-third the width of head, very slightly converg- 

 ing anteriorily; orbits distinct, each slightly less than half as wide as fron- 

 tal stripe; four pairs of orbital bristles present, the upper one in almost 

 transverse line with the anterior angle of frontal triangle, very weak, the 

 second about twice as long and very strong, the third much weaker, but 

 still stronger than the upper, and the anterior pair of about the same 

 strength as the upper, or posterior, pair; a few weak, scattered hairs present 

 on orbits between the bristles and the eye margin; vertical bristles strong; 

 antennae moderate in size, situated about middle of head in profile, third 

 joint rounded, the pubescence very short; arista thickened at base, taper- 

 ing, its length equal to from its base to the upper orbital bristle, pubescence 

 very indistinct; cheek very short and narrow, less than one-sixth the height 

 of eye and almost as high as long; marginal bristles dist met but not numer- 



