026 [December 



blackish hairs on its dorsum. Venter with dark graypubescence. and in the imma- 

 ture specimen tinged with rufous. Legs pale, very slightly tinged with fuscous 

 above and on the tarsal tips. Wings with rather fine, sparse, gray pubescence, 

 but with the normal fringe behind; fringe as long as usual. Costal vein full as 

 slender as the 2nd longitudinal; 1st longitudinal very distinct ; cross-vein be- 

 tween 1st and 2nd longitudinal entirely absent ; 2nd longitudinal not sinuate 

 or incurved near its base and reaching the margin a trifle nearer the tip of the 

 wing than in Fig. 1. Dipt. N. A. p. 174, scarcely recurved at tip, and elsewhere 

 almost perfectly straight, or if anything curved forwards rather than recurved. 

 Anterior branch of the .Srd longitudinal vein slender and in one wing obsolete 

 on its basal i, in the other wing of the same % it unites normally with the main 

 vein, and nearly describes the curve formed by one edge of a lanceolate leaf fi 

 times as long as wide. Length % .OS inch; wing % .09 inch. 



Described from two S , which came out July 15 and shortly after- 

 wards, one of them immature and with the wings badly shrivelled, the 

 other mature; 9 unknown. Very rare near Rock Island, Illinois- 

 There can be no doubt of the identity of the pupa and imago, as both 

 % % were bred from pupae dug out of the cylindrical burrows in which 

 they reside. 



Genus CECIDOMYIA.— Subgenus DIPLOSIS. 

 Like the subgenus Ctcidomyia, this subgenus seems to consist partly 

 of gall-makers and partly of inquilines. To the true gall-makers belong 

 apparently D. cart/se 0. S., D. rohimse Hald. and possibly Cec. (diplo- 

 sis 't) psfjulacacise. Fitch. I describe below four species which are, be- 

 yond all doubt, inquilinous in their habits, and it will shortly be shown 

 that the European D. tibialis Wz. must be so likewise. 



D. Diplosis atrocularis n. sp. 'J, 9 (Recent.) — -Whitish, tinged more or less with 

 gamboge-yellow; beneath almost white. iTeac? with the ej^es coal-black and 

 very conspicuous both in the recent ami the dried specimen, whence the speci- 

 fic name. Antennae % very slender, half as long again as the dried body, 23 — 

 24-jointed (2-|-21 to 2-|-22), the joints globular and slightly obfuscated, in the 

 mature specimen towards the tip of the antenna scarcely or but very slightly 

 large and small alternately, in the less mature specimens more obviously so, 

 difficult to count from 2 or 3 of the terminal ones being sometimes more or less 

 sessile and simulating an elongated club; the pedicels hyaline and as long as 

 the globular part of the joint: the verticils scarcely as long as two of the 

 complete joints from which they si:)ring, usually, except in immature % %, 

 directed forwards at an angle of 45° with the axis of the antenna, instead of 

 being nearly at right angles with it. Antennae 9 slightly tinged with dusky, 

 much more robust than in %, . J — I as long as the dried body, 14-jointed (2-|-l2). 

 the last joint slenderly cylindrical, acute at tip, sessile, evidently connate with 

 the penultimate, and in the dried specimens sometimes obsolete, so that the an- 

 tenna is properly 13-jointed. not 14-joiutod: the other joints of the flagellum 



