120 DRAGONFLIES OF NORTH AMERICA 
KEY TO THE SPECIES 
Adults 
1 Abdominal appendages pale; thoracic stripe 4 complete........ 
PSPS ERD PE SARE 107 eRe albistylus, p. 120 
Abdominal appendages black; thoracic stripe 4 interrupted...... 
wt): cavnpile ohh de onbreoe quleeegeraer parvulus, p. 120 
76. Lanthus albistylus Hagen 
Hag. ’78, p. 460: Mtk. Cat. p. 88: Howe 718, p. 31: 23, p. 180: Garm. ’27, p. 139 
Syn: naevius Hag. 
Length 36 mm. Expanse 46 mm. Me. to N. C. and Tenn. 
The smallest and daintiest of our clubtails, a greenish species heavily marked 
with black. Face pale, cross lined with black on all the sutures, the upper and 
middle sutures conjoined by an inverted black 7, the lower stripe runs down on 
the middle of the labrum and the latter is bordered with blackish. Thoracic 
stripes of the first pair are broad and broadly confluent and strongly widened 
downward. Stripes 2 and 3 are of about equal width and well separated by a 
pale stripe. Stripes 4 and 5 are complete. Legs black. Wings hyaline with 
stigma and costal margin brown. Middorsal pale line of abdomen narrows at 
the third segment and disappears at the fourth. Sides of 8 and 9 yellow. Ap- 
pendages yellow. 
77. Lanthus parvulus Selys 
Selys 54, p. 56: Mtk. Cat. p. 88: Howe ’18, p. 31: 23, p. 132: Garm. ’27, p. 140. 
Length 38 mm. Expanse 48 mm. N:.S.,.N: Yao: 
A very pretty little blackish species. Face greenish cross lined with black 
on the sutures and overspread with the same between the two lower ones (ante- 

clypeus). Labrum bordered with black. Thoracic stripes of the first pair very 
broad, confluent, widened below and conjoined there with the 2nd, whereby 
the isolated intervening pale stripe is narrowed downward and abbreviated. 
Stripe 2 rather broad and broadly confluent with 3, leaving usually only a little 
