Pakt II.] 
Waterston : On Chalcidoidea. 
S 
the single spur. The surface of the latter is more or less frayed or densely 
pilose. Viewed from below the apex of the tibia more or less conceals 
the spur. 
In the Haltichellidae the hind tibia is abruptly truncate with two 
smooth spiurs which are plainly visible from below where they are not 
exceeded by the short apex of the tibia. 
Genus Chalcis. 
In spite of the attempts made to divide it, this genus still remains 
compact though comprising numerous species. For the purpose of 
subdivisioir the antennal formula is useless when once it has been recog- 
nised that the funicle consists of a ring joint, seven other joints and a 
club which may appear to be from 1 to 3 jointed. Mr. J. C. Crawford 
in an excellent paper on the Chalcidoid jrarasites of the Gipsy Moth 
(Bull. No. 19, Pt. II, United States Department of Agriculture, Bur. of 
Ent. 30. IV. 1910) has indicated some of the essential characters for 
certain groups of species within the genus. 
At least two of these groups are represented in the present collec- 
tion which includes five species of the genus. In the ‘ ’group, of 
whichbilobala Cam., maybe taken as a representative, the antennae are 
stout (fig. 4) the second normal funicular joint being transverse, both 
mandibles are bidentate, and both keels rising from the genal keel, 
are strongly marked (fig. 3y. The hind coxa (9) is simple. 
Fig. 1. Chalcis inarginata Ca,m. ($). 
Head, front view and profile. 
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