1908] 
Illuttkoicsli, Dragon, Flics of Wisconsin. 
Either of these three species may be found within the state in the 
future, though as yet no specimen has been taken. But G. plagiatus 
can be expected with some assurace, since it is very common in Illinois. 
Gomphus plagiatus Selys. Thorax brown, marked with yellow. 
Dorsal stripes diverg-ent, two lateral stripes on each side of the thorax. 
Abdomen brown, segments 1 — 6 with an interrupted stripe of yellow or 
green. Life Zone : Upper Austral. Eecorded also from the Gulf strip 
of the Lower Austral. 
Because of its great similarity to the two species of this group 
the imagoes, especiallj^ the females, are easily confounded with each 
other. A short description of the sexual organs may serve to facilitate 
identification. 
Male. Superior appendages widely divaricate, the lobes broad, sub- 
parallel, the apex with several minute inferior teeth, obliquely 
truncate to an external anteapical angle plagiatus 
Female. Occiput straight, or slightty convex ; vulvar lamina short, 
the apex emarginate, the tips, acute plagiatus 
Male. Superior appendages without well-marked anteapical angle 
notatus 
Female. Occiput slightly concave ; vulvar lamina exceedingly short, 
bifid, the branches divaricate, rounded notatus 
^Fale. Superior appendages divaricate, the lateral external margins 
subparallel. the apex up-turned, with inferior minute teeth 
• • sp'niceps 
Female. Occiput with a slight median notch ; vulvar lamina short 
rounded spiniceps 
DROMOQOMPHUS Selys, Bull. Ac. Belg. 21 (2), p. 58, 1854. 
A genus intimately related to Gomphits, from which it differs 
mainly by the anal loop of two cells, and likewise by the fact that 
vein A I is strongly angulated near its origin and forming one 
side of the loop, thus apparently arising from the outer angle of 
the anal loop. A prominent distinction are the extremely long 
hind femora, with armature of five to eight long strong spines. 
The species do not love the rushing streams and rapids of their 
nearest relatives, the Gomphines, but frequent the more quiet 
waters of creeks and ponds. 
Hind femora entirely black spinosus 
Hind femora j^ellow, the apex darkened spoliatus 
Dromogomphus spinosus Selys, Bull. Ac. Belg. 21 (2), ]). 50, 1854; 
Hagen, Syn. Neur. N. Am., p. 102, 1861 ; Needham, Bull. 47, N. Y. State 
Mus., p. 461, 1901 (Bibliography & Desc. of nymph). 
Abd. male 41, female 43 ; h. w. male 34, female 36. 
Male. — Black or brown, marked with olive. Face and occiput yel- 
lowish, vertex black. Thorax above olive, humerals brown and wide, 
equal to the width of the dorsal green area. On the dorsum the brown 
gives off a stripe below, Avhich curves upward parallel to mid-dorsal 
carina, disapjDearing above. The brown humeral is divided by a sin- 
uous green antehumeral. Legs black, fore femora gTcen beneath. 
Wings hyaline, costa and nervure black, pterostigma dark brown. Ab- 
domen black, yellowish beneath. Dorsum with a green stripe, twice 
