Dcscriptions of Hvmenoptera from Baltic Amber. 
11 
The following wing-measurements are in micromillimeters : 
Length of second submarginal cell 
Lengtli of third submarginal cell (obliquely) 
Third submarginal cell on marginal 
First recurrent nervure from base of second submarginal 
First recurrent nervure to apex of second submarginal 
Lengtli of first submarginal cell 
Length of marginal cell (approximately) 
Depth of marginal cell (approximately) 
Prussian amber; one specimen. 
816 
816 
306 
255 
680 
850 
2380 
493 
Chcilcobombus gen. nov. 
§ . Small and compact, about 8 — 8V 2 mm long, with subglobose 
abdomen; parts of the insect, at least in some species, with metallic 
tints; eyes not hairy; ocelli large (about 238 p diameter), close together, 
in a slight curve; head broad; antennae close together (238 p between 
antennal sockets), much less distance between antennal sockets than 
from either to eye; facial quadrangle much longer than broad; scape 
rather long, curved; mandibles Apis-Yike, with two marginal notches, 
the upper one strongest; mouth-parts elongated, projecting about 2380 p 
beyond head; tongue slender, very hairy, projecting 850 p beyond 
apex of second joint of labial palpi; apical spoon circular, pale; small 
joints of labial palpi ordinary, eacli about 136 p long; scutellum pro- 
minent, as in Protobombus , and hairy; hind basitarsus broad and short, 
not nearly twice as long as broad, apical angle sharp; pulvillus large; 
claws with a strong but short inner tooth beyond the middle; stigma 
triangulär, distinct; marginal cell rather deep, not especially long, 
ending rather obtusely, away from costa, with a small appendiculation ; 
three subequal submarginal cells, the first rather the larger; second 
submarginal greatly narrowed above, narrower on marginal than third, 
and receiving first recurrent nervure beyond its middle; third sub- 
marginal narrowed at least half above, and receiving second recurrent 
nervure a short distance before its end; basal nervure meeting trans- 
versomedial; trans versomedial of hind wings somewhat oblique, the 
lower end more basal. There is a strong comb of closely set blunt 
spines on the apex of the hind tibia. 
Type Chalcobombus liumilis, from the type-specimen of which all 
the above characters have been derived. 
This genus appears to represent a side branch near to the others, 
but not ancestral to anything now living. 
