82 Bulletin Wisconsin 'Statural History Society. [Vol. 6, Nos. 1 — 2. 
But, due probably to collecting restricted to very few localities, 
not many species have thus far been found. From the Museum 
reccwds I find that collection in localities which otherwise would 
certainly have been attended by success was belated in regard to 
Gomphines. 
The compilation of a table for identification purposes presents 
certain difficulties, especially in finding a constant factor for dis- 
tinguishing the different species. In the male the distinctive char- 
acter is the form of the superior abdominal appendage, a quite 
constant feature. In the females the form of the occiput has been 
accepted as distinctive. But in several cases considerable variety 
was proven among representatives of the same species. The fol- 
lowing dichotomy comprises mostly Gomphines found in the 
Boreal, Transition and Upper Austral life Zones : 
1. Face entirely yellow 2 
Face transversely banded Avith black 22 
Face blackish. .\ , 28 
2. Occiput concave, convex, or notched 3 
Occipnt with a median, prominent spine villosipes 
3. Thoracic markings obsolete 4 
Thoracic marking-s distinct 5 
4. Superior abdominal appendages shorter than inferiors. . .lentulus 
Superior abdominal appendages longer than inferiors .... pallidas 
5. Tibiae yellow externally 6 
Tibice black externally 14 
6. Abdominal segments 7 — 9 strongly dilated 7 
Abdominal segments 7 — 9 little dilated 8 
7. Superior abdominal appendages of male with an outer trun- 
cate tooth; vulvar lamina short, broad, bifid graslinellus 
Superior abdominal appendages without an outer tooth, the 
lateral margins parallel ; vulvar lamina long, bifid, contig- 
uous, the apices separating, acute externus 
8. Leno-t,h of abdomen about 45 mm 11 
Length more than 45 mm 11 
9. Segment 9 of abdomen yellow, length about 45 mm 10 
Segment 9 of abdomen brown, length about 41 mm cavillaris 
10. Ground color yellow, length about 45 mm intricatus 
Ground color brown, length about 45 mm exilis 
11. Colors olive and fuscous , 12 
Colors yellow, or brown, and fuscous 13 
Colors yellow and black ; male superior appendages with a 
long inferior basal tooth ; vulvar lamina very short, the apex 
^^^"^^^^ minutus 
12. Male superior abdominal appendages with a sharp inferior 
tooth; vulvar lamina of two triangular lobes, one fourth 
the length of 9 spicatus 
Male superior appendages with an Inferior lobe ; vulvar lamina 
of two rounded lobes, very short sordidus 
