448 The Ohio Naturalist. [Vol. Ill, No. 8, 



The evidence from these observations is that L. longitarsis is the 

 male of G. bicolor, just as shown in previous part of this paper, 

 L. typhlocybse is undoubtedly the male of D. ornienidis. 



In view of these observations and considerations, one can 

 hardly escape the inference that the genus Labeo may, by further 

 observations and rearing of larvae of the different species be found 

 to contain males of yet other genera of Dryininse. The same 

 might be inferred of other genera of Dryininte that have hitherto 

 been known only as males. Rearing larvase as above, or in more 

 complete detail, will be helpful, or it ma}' be said, in fact, neces- 

 sary in properly associating the males and females of this sub- 

 family and establishing their true generic and specific relation- 

 ship. 



In regard to the species under consideration, since G. bicolor 

 and L. longitarsis have the same date of description, and since 

 Gonatopus was the earlier of the two genera to be described, I 

 would place the S3'nonomy thus : — 



Gonatopus bicolor Ashm., Bui. 45, U. S. Nat. Mu.s., p. S5, 1893. 



Lixbco loiioHarsis Ashm., Bui. 45, U. S. National Mus., p. 88, 1893. 



MORPHOLOGY OF THE CHELATE FORE-TARSUS OF THE FEMALES 

 OF THE SUB-FAMILY DRYININ.E 



This pectiliar structure is shown Plate 20, Fig. 7 and Plate 21, 

 Fig. 14. It occurs in the females of nearly all the genera of the 

 group. The fifth tarsal segment is enbirged and has a very 

 peculiar elongate, backward extension from its outer side. This 

 extends as far as to the proximal part of the second tarsal seg- 

 ment. It is curved, slighth^ tapering till near the tip where it is 

 somewhat enlarged. At the distal end e f the fifth segment are 

 borne two claws with a pulvillus between them. The inner claw 

 is about normal size ; but the outer one is greatly elongated and 

 articulated with the fifth segment in such a way that it may clo.se 

 up with the prolongation forming a forceps or chela (Plate 21, 

 Fig. 14). The tip of the claw nearly reaches the lip of tarsal 

 prolongation ; it has a notch which forms a secondary tooth. At 

 the tip of the tarsal prolongation and extending outward is a 

 group of Indian-club-shaped appendages There are several of 

 the.se also along its outer side, and a few on the claw as well. 



"This peculiar chelate tarstis is found in no other grottp among 

 the Hymenoptera" (Ashmead). No observations were made 

 which would give one a hint of the p.irtictilar use of this chela. 

 May it be suggested, however, that it is u.'^ed in some special 

 manner in clinging to the host during the act of egg- deposition. 

 The members of the family Proctotrypidae are chiefly ^^^ para- 

 sites, but this particular grotip of the famil>- are parasitic ui)on 

 larvae, principally of the families Fulgoridce, Meml)racidce, and 



