402 



NEW YOHK STATE MUSEUM 



three-fourths; tarsi of middle and hind legs bordered anteriorly and posteriorly 

 by rows of stout spines. 



Abdomen broad at base, slightly depressed ; apex obtusely pointed , 

 invested with short, scattering setae. Terminal segment of female with 

 a median process, laterally dilated at base and a pair of suboval appen- 

 dages near the apex; width to length of median process as 1 to 4; lateral 

 dilation nearly equal to length of median process ; subapical appendage 

 one-fourth the length of median process (figure 8). Terminal segment 

 of male with an irregular, dorso-lateral plate, the ventral portion of which is 

 prolonged. Two pairs of organs extend from the plate — an upper straight 

 pair, bearing numerous long setae on the entire surface, and a lower pair, 

 slightly curved ventrally and bearing several long, usually sharply curved 

 setae at their tips. Below this armature there is a darker chitinous ring, 

 within which are the essential organs. 



Length of body, 1.5 to 2 mm.; of wing, 2 mm. Described from about 75 

 specimens of both sexes. 



Close to the female of Phora setacea Aid. as described and figured in the 

 Canadian Entomologist, xxiv, 1892, p. 144, fig. 2. This species may be sep- 

 arated by the anterior row of frontal bristles being a nearly straight transverse 

 one, while in setacea they are represented as obliquing posteriorly from the 

 median line ; the anterior pair of proclivate bristles are also relatively smaller 

 and more nearly in front of the other pair. The coxae of the female, as well 

 as those of the male, have a number of large sub-apical bristles on the outer 

 side, and the " conical protuberance " on the hind side of the third coxa is 

 about equally developed in both sexes ; the fore and middle legs are darker 

 than in P. setacea . 



None of the marked sexual features indicated by Mr. Aldrich, except those 

 of the genitalia, have been observed in agarici. It is probable that the insect 

 described as the male of setacea belongs to a distinct species from that of the 

 female . 



Peculiar Wing-Pores in Phora. 

 Mr. E. P. Felt, in his study of this insect in connection with its 

 illustration, etc., has made some interesting observations upon the 

 " wing-pores " which he has detected, and of which he has written as 

 follows: 



An additional character which may prove to be of specific value is found in 

 the number and location of certain " pores " or pore-like structures. The 

 pores — four in number — occur in a slightly curved row along the middle line 

 on the under side of the second heavy vein, where it anastomoses with the 

 costal vein; a short stump extends beyond the anastomosis and inclines a little 

 away from the costa. 



The pores are less than half their diameter apart, the last one being close to 

 the apex of the stump (figure 10). Each consists of a depression surrounded 

 by a raised circular ring of chitine (figure 11). These pores must not be con- 

 founded with the scars on the costal vein left when a bristle is removed; they 

 appear to have no connection with either bristle or setae. Some twenty-five speci- 



