351 



Agromyza tiu^ Coiiden 

 Agromyza tiliw Couden, Proc. Ent. Soc. Wash., Vol. 9, 1908, p. 34. 



Puparium. — Length, 2.5 mm. Yellowish white, shining. Seg- 

 ments poorly defined but distinguishable ; surface without hairs or pro- 

 tuberance except the anterior and anal respiratory organs. Anterior 

 respiratory organs of moderate length (PI. LXXXIV, Fig. 18), located 

 on dorsum of first segment, separated from each other by less distance 

 than the length of one of the organs. Anal respiratory organs shorter 

 and comparatively stouter than anterior pair (PI. LXXXIV, Fig. 19) ; 

 anal orifice distinct, a few fine irregular reticulated lines on dorsum 

 cephalad of the orifice. 



The puparium from which the above description is drawn is one of 

 a lot collected by J. J. Davis at Chicago October 6, 1908, the imagines 

 emerging May 24, 1909. The species makes galls on twigs of linden 

 trees. Besides these specimens there are several in the collection here 

 which were reared by Marten several years ago at Urbana. The galls, 

 "at base of leaf petioles of basswood", were obtained September 27, 

 1 89 1, and the imagines emerged May 2, 1892. Originally figured and 

 described from Missouri, and recorded as making galls on linden. I 

 subsequently recorded the species from Veitch, Va., and doubtfully 

 from Delaware County, Pa.* 



Agromyza anguIvATa Loew 



Agromyza angulata Loew, Berl. Ent. Zeitschr., 1869, p. 47. 



Larva. — Length, 1.75 mm. Pale greenish or whitish. Segments 

 laterally conspicuously swollen, the incisions between them deep, so 

 that viewed from above the whole larva presents a somewhat monili- 

 form appearance; viewed from the side the larva is not so thick as 

 across the dorsum and the segments present a more even surface with 

 little indication of swellings or constrictions. Mouth parts black and 

 of moderate size ; armature consisting of 4 hooks, one at apex, a trans- 

 verse pair slightly caudad of it, followed by another one at the lower 

 posterior angle of the anterior face. Prothoracic respiratory organs 

 very small and inconspicuous (PI. LXXXIV, Fig. 2). Segments 

 throughout with microscopic wartlike processes, which are rather 

 widely separated on the surfaces of the swollen portions ; apex of abdo- 

 men as in Figure 3, Plate LXXXIV. 



Puparium (PI. LXXXIV, Fig. 12). — Length, 1.25 mm. Glossy 

 black, with purple or violaceous reflections, especially in the depres- 



*Aiiii. Ent. Soc. Amer., Vol. 6, 1913, p. 327 



