202 Psyche [December 



yellow markings on the second segment would indicate that it 

 belongs here rather than to A. bulla, while the great amount of 

 yellow on both the third and fourth segments bars it from A. 

 himaculata. This characteristic suggests, however, that bulla, 

 bimaculata and nigrina may possibly represent extreme variations 

 of one species, but much more material would be necessary to 

 prove this. 



Acrocera obsoleta Van der Wulp. 

 A. obsoleta V. d. Wulp. Tijdschr. v. Ent., II, 2nd. ser., p. 139 pi. 3. f. 17, 1867. 



A specimen which I am referring to this species was taken by 

 Mr. A. P. Morse at Orona, Me., August 5, 1915. The abdomen is 

 bright yellow except for a narrow basal margin, a dorsal triangle at 

 the base of the third segment, and a small anal spot of black ; venter 

 yellow, segment with narrow, whitish, posterior margins and lateral 

 spots of black. Wings whitish hyaline, with very pale veins, giving 

 them an obsolete appearance. Length, 5.5. 



Van der Wulp in figuring the wing indicates all but the auxil- 

 iary and first longitudinal veins by dotted lines; "alarum nervis, 

 praeter nervos longitudinales duos priores obsoletissimis; furca in 

 apice petiolo breviori," would, however, indicate that they were 

 present and all are shown except the second longitudinal vein. 

 The branch of the third longitudinal vein and anterior cross vein 

 are the first to disappear as in the case of A. unguiculata. 



Acrocera iingmculata Westwood. Figure 4. 



I am referring to this species two specimens which have two 

 important characters in common, i. e., the branch of the third vein 

 and the anterior cross vein are wanting. The smaller specimen 

 which was taken at Fort W^ashington, Md., May 26, 1895, measures 

 3 mm. in length. The third segment has a large, yellow, transverse 

 spot on the posterior half, not reaching the lateral margins; the 

 fourth segment is yellow except for a narrow anterior margin. 

 Wings whitish hyaline. The larger specimen measuring 5 mm., 

 was collected at Leliigh Gap, Pa., July 10, 1897 (H. L. Viereck). 

 The yellow on the abdomen covers all of the fourth, all but a nar- 

 row anterior margin on the third, and the posterior dorsal fourth, 

 of the second segment. The wings are brownish hyaline. The 

 abdominal markings agree fairly well with Westwood's description 



