GOMPHUS 103 
mentary dorsal hooks are present on a variable number of abdominal 
segments, and lateral spines are present on segments 6 or 7 to 9. 
The following table will assist in determination of the nymphs of 
those species that have hitherto (1928) been made known. 
10 
11 
12 
13 
KEY TO THE SPECIES 
Adults 
Faces faintly cross striped with brown...................... 2. 
CENA NGI he De Sao) PART RUN AR) Abner 92 4), Ge! id a lck Ae Nee 5. 
pane less tia nrouniils wert ash se iotite. fais. +. «lasso eee 3. 
Pepansemore Liam Gums Me Fs Ss «35 es core ae ok 4, 
Middorsal yellow stripe on middle abdominal segments 
Eee Mee SRE TIC. wit Mees MAPA Mee fr 4 | brimleyi, p. 106 
Middle abdominal segments obscure brown..... cavillaris, p. 105 
Stripes 4 and 5 confluent; top of stripe 2 turns toward 3 
ett AG & NEES eR reo ee eee are abditus, p. 110 
Se UIE. 2 Re, San SSR a 6g a australis, p. 109 
mibia- yellow externally. jieC sey ssctec te vo guyare ees Ye ds oe Ae 6- 
ube notyellow,extermmally os... 2. cu. bya BS ee ee A a. 
Stripe 2 free below; legs yellow................ intricatus, p. 99 
BErIpe 2 CONNECLCUSWItM COUMEAN ¢ 3... sagls dl oh ton ed aibvene Sa Bhs a 
Abdominal appendages yellow................. militaris, p. 104 
Abdominal appendages brown or black...................... 8. 
Eiacpanse less than Sd pete. ops ded sees oe ee Lee 9. 
Pxpanse more than 53) 2..65.80..6 eke ke a 10. 
Stripe 2 free above; 1 not fused; 4 and 5 separate; tarsi 
ela w RbOVE. eh st on a ken oe oR ee ee minutus, p. 107 
Stripe 2 not free above; 1 fused; 4 and 5 united; tarsi black above 
Re ac a Raat ais chores sc Sigs. 3, wai Sac eagae ge exilis, p. 108 
Stripe 4 about equal to 5....graslinellus and williamsoni, p. 107 
Stripe.4 serosa Gderit Mam 1D ).0/-5 3. ysedes pcre sons) beahfeleuined enters lividus, p. 104 
Stripes 1 and 2 confluent above and below; 4 broader than 5 
RNR Awe A hk 2 ERO ch hoe a REE I 6 8, Spicatus, p. 108 
Sinipes,land.2 separate. above collar .....2. ova. ete ee oe 12 
Expanse lesaithancdSse. ).0). ead owed Decree quadricolor, p. 111 
Expankse more than 582029)... oy. 6S 2Oe ee eee ee 13. 
Hege all, Dinck roe ck oe ales Saget Eee descriptus, p. 109 
iBasecor femora Yelow }7; <0. sca. tale eee borealis, p. 110 
