THe HyMENOPTERA OF MINNESOTA 
Hind Wings 
Veins Veins 
Costal Costa 
Subcostal R+M 
Median Cubitus 
Anal Free part of Ist A 
Accessory neespartron edu 
Radial R;—R, 
Axillary 3d A 
Cubital M—R,t+,+M, 
Subdiscal m and M, 
First transverse cubital M 
Second transverse cubital R, 
First recurrent Medio-cubital cross-vein (m-cu) 
Second recurrent Transverse part of M, 
Cells Cells 
Costal C+Se, 
Subcostal M 
Median M:+ Cu+Cu, 
Lanceolate sie ZN 
Anal 2d A+ 3d A 
Radial Rjt. 
First cubital R+Ry4; 
Second cubital Rk, 
Lower discal M,+1st M, 
First posterior M, 
Second posterior 2d M, 
KEY TO SUPERFAMILIES. 
1. A deep constriction at the base of the first abdominal segment,* conspicuously 
separating the abdomen from the thorax. 
No marked constriction at the base of the abdomen, ‘the thorax and anterior 
abdominal segments being approximately equal in breadth. 
151 
to 
Tenthredinoidea Page 152 
2. First abdominal segment* (sometimes also the second) forming a lens-shaped 
scale or knot (petiole), strongly differentiated from the remaining abdominal 
segments (gaster) : Formicoidea Page 198 
Abdominal segments not strongly differentiated as petiole and gaster 3 
3. Mesothorax anteriorly without the free prepectus shown in illustration of 
Chalecidoidea (ig. 66) 4 
Mesothorax anteriorly with a prepectus as shown in Fig. “66; usually winged, 
with venation reduced to a minimum as in Fig. 65; usually less than 3 mm. 
length and metallic. . i ; ; Chalcidoidea Page 180 
4..Tegulae present, wings nea ell devareped: sometimes vestigal or lost Dd 
Tegulae ES wines epnely absent, habitus es as in Ee 
forms. e 
5. Pronotum ach its hia vantes or eeubeneles fnnigent ha a werent aie Ghar 
tangent to anterior edge of teulae, touching or underlying tegulae 6 
Pronotum with its hind angles or tubercles always distinctly remote from 
tegulae. 2 : 5 : 5 12 
6. Body not flea- like he ‘ F us 
Body flea-like; trochanters usually, composed of a single joint; wings usually 
with a characteristic venation as shown in Vig. 65. . : Cynipoidea Page 177 
*In all Hymenoptera the segment which is morphologically the first abdominal 
segment (propodeum) is intimately fused with the thorax, of which it seems to be a 
part. In this work, the general usage of descriptive writers is followed, and the 
segment which is apparently the first abdominal segment, though morphologically the 
second, is uniformly called the first abdominal segment. 
