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. typhlocybae is undoubtedly the male of D. ormenidis. 
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 Dryiuinae. The same 
might be inferred of other genera of Dryiuinae that have hitherto 
been known only as males. Rearing larvaae as above, or in more 
complete detail, will be helpful, or it may 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 I,, longitarsis have the same date of description, and since 
Gonatopus was the earlier of the two genera to be described, I 
would place the synonomy thus : — 
Gonatopus bicolor Ashm., Bui. 45, U. S Nat. Mus., p. 85, 1893. 
Labeo longitarsis Ashm , Bui. 45, U. S. National Mus., p. 88, 1893. 
MORPHOLOGY OF THE CIIELATE FORE-TARSUS OF THE FEMALES 
OF THE SUB-F'AMILY DRYININ.E 
This peculiar 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 enlarged 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, slightly tapering till near the tip where it is 
somewhat enl irged. At the distal end cf 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 close 
up with the prolongation forming a forceps or chela ( Plate 21, 
Fig. 14). The tip of the claw nearly reaches the tip 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 
these also along its outer side, and a few on the claw as well. 
This peculiar chelate tarsus is found in no other group among 
the Hymenoptera” (Ashmead). No observations w r ere made 
which would give one a hint of the particular use of this chela. 
May it be suggested, however, that it is used in some special 
manner in clinging to the host during the act of egg deposition. 
The members of the family Proctotrypidae are chiefly egg para- 
sites, but this particular group of the family are parasitic upon 
larvae, principally of the families FTilgoridae, Membracidae, and 
