166 DRAGONFLIES OF NORTH AMERICA 
4 Costa: browns!) ; oct ere eon, Senet. seit), Ss, 5. 
Costa yellow crete: 28 ee AO ee Serhan heh dl 6. 
5. . Hxpanse Over 1153) sn a taeniolata, p. 167 
Expanse less than 100 mm. : .... 2.) J 620.0 9.: georgiana, p. 169 
6 Pale stripe on front of thorax abbreviated and pointed above. . 
ae es iSig sat OR eS eA Ch re wabashensis, p. 167 
Pale stripe on front of thorax broader and reaching almost to 
CATING, se heef os b's end g cee Se ae ee OS eee en ee Pe ee 
7 Pale spots of middle abdominal segments divided on median line 
Hee GUE ig DNS GAS Soe OES SEE ee ee pacifica, p. 168 
Pale spots of middle abdominal segments not divided on median 
lime? vertex Dale sss oi. ij esi heen Bae eae Sie sce ee 8. 
8 Transverse pale spot on abdominal segment 2 entire; antenodals of 
fore wing 14 Tom Sees a, eee ee eee annulata, p. 168 
Transverse pale spot on abdominal segment 2 divided; antenodals 
ofore. wine Te Tora e ee Se ce, dee magnifica, p. 168 
121. Macromia illinoiensis Walsh 
Walsh ’62, p. 397: Mtk. Cat. p. 120: Wlsn. 712, p. 193: Howe 719, p. 52: Garm. 
27, p. 204. 
Length 70 mm. Expanse 100 mm. N. Eng., N. Y., Pa., Del., N. C. 
Another darkly colored species, lacking pale stripes on the front of the thorax. 
Face brownish, paler on middle of labrum and on most of the postclypeus. 
Top of frons with four yellowish spots on a brown ground, two within and two 
without the median furrow. The single median side stripe of the thorax is well 
defined and there is another obscurer one on the hind margin below. Legs black. 
Wings hyaline, except for a tinge of brown in the membrane at the extreme base. 
Costa and stigma brown. Pale spots of abdomen of slight extent, divided by 
black on the middorsal line except on segment 7, where fused into the usual 
saddle mark, which does not extend down to the lateral margin of the segment. 
Segments 8, 9, and 10 and appendages black. 
Walker (’08, p. 17) says: 
This insects frequents woodland paths and glades in the neighbor- 
hood of large lakes and rapid streams, coursing swiftly back and 
forth over its chosen part with almost tireless energy. It appears about 
the end of June or first week in July, and remains until the latter part 
of August. 
This species frequents lakes as well as rivers. Williamson (’09, p. 369) 
observes that 
At Sandusky, Ohio, where M. Illinoiensis has been taken in large numbers, many 
collect toward evening in the cedars on Cedar Point, several individuals fre- 
