125 



Smith and Pritchard: Odonata 



-' 



pair of stout processes on venter of first abdominal 

 segment; fore wing triangle distinctly convex on outer — 



side Plathemis Hagen 



Arculus at or very close to second antenodal cross 8, 

 vein (fig. 4:44); male without ventral processes of 

 first abdominal segment; fore wing triangle straight or — 



very slightly convex on outer side 29 



. Wings marked with reddish Belonia Kirby 9, 



Wings marked with black, white, or hyaline 



Libellula Linnaeus — 



. Wing with anal crossing directly opposite A 2 31 



Wing with anal crossing proximal to origin of A 2 . . . . 32 10. 

 . Fore wing subtriangle with 2 cells 



MacTothemis Hagen 



Fore wing subtriangle with 3 cells (fig. 4:54) — 



Brechmorhoga Kirby 



Hind wing triangle with a cross vein (fig. 4:42) .... 11. 



Pseudoleon Kirby — 



Hind wing triangle without a cross vein 12, 



Micrathyria Kirby 



Radial planate subtending 1 row of cells 34 — 



Radial planate subtending 2 rows of cells 36 13, 



Vein M 2 undulate Macrodiplax Brauer 



Vein M 2 smoothly curved 35 — 



Wing with one cross vein beneath stigma 



Miathyria Kirby 



Wing with 2 cross veins under stigma. . .Tauriphila Kirby 

 Abdominal segment 4 with a median transverse carina 14, 



37 



Abdominal segment 4 with only the transverse carina — 



near caudal end of segment 38 



Vein M 2 strongly undulate (fig. 4:57). .. .Pantala Hagen 15, 

 Vein M 2 evenly curved (fig. 4:56) Tramea Hagen 



Hind wing with bisector of anal loop about twice as — 

 far from A t as from A 2 at base of anal loop (fig. 4:58) 



dJythemis Hagen 16, 



Hind wing with bisector of anal loop at least 3 times 



as far from A l as from A 2 (fig. 4:55) 



Paltothemis Karsch — 



Naiads 



17 

 Head with a prominent upturned frontal horn between 

 the bases of the antennae (figs. 4:10m,o; 4:36); legs — 



very long MACROMIINAE 2 



Head without a prominent upturned frontal horn (fig. 18, 



4: \0d-j) CORDULIINAE and LIBELLULINAE 3 



Lateral spines of 9th abdominal segment reaching to 

 apex of anal appendages (fig. 4:136); lateral setae of 

 labium 3 or 5; dorsal hook on segment 10 absent — 



Didymops 



Lateral spines of 9th abdominal segment reaching 

 less than halfway to apex of anal appendages (fig. 

 4:13a); lateral setae of labium 6; small dorsal hook on 19, 



segment 10 Macromia 



Abdomen with dorsal hooks or knobs present on 1 or — 



more segments (best seen in lateral views) 4 



Abdomen with dorsal hooks or knobs absent on all 

 segments, sometimes vestigial tubercles or tufts of 20 



hair present 27 



Dorsal hook or knob present on abdominal segment 9 — 



5 21 



Dorsal hook or knob absent on abdominal segment 9 



16 



Lateral spines of abdominal segment 9 reaching to or — 

 beyond the tips of the anal appendages (figs. 4:10; 



4:13c) 6 



Lateral spines of abdominal segment 9 shorter, not 

 reaching to tip of anal appendages (fig. 4:13e-A) ... 8 22 

 Frontal shelf present between bases of the antennae, 



lateral setae 5 to 6 (fig. 4:10/) Neurocordulia 



Frontal shelf not present between bases of the anten- — 

 nae, low and rounded, not produced into a flat triangle 



(fig-. 4:10p) 7 



Distal half of dorsal surface of mentum heavily setose; 23 



Naiads of W illiams onia and Cannaphila are unknown. 



lateral setae 4 to 5 (fie,. 4:112) EpiOOt 



Distal half of dorsal .surface of merit Urn with few or 

 generally no setae; lateral setae 6 (o 8 . .Tt trogon 

 Lateral anal appendages nearl\ ■ .superior 



appendage 9 



Lateral anal appendui ne-h&lf or Lesa the length of 



superior appendage 10 



Dorsal hooks absent on segments 3 and 1, crenulationi 



of the lateral lobes deep (fig. 4: lit) Helocordulia 



Dorsal hooks present on segments 3 and 4; orenulationa 



of the lateral lobes shallow Somatochlora (in part) 



Dorsal hooks cultriform, the series in lateral view like 

 teeth of a circular saw; lateral setae of labium 5 or (1 



(fig. 4: 13A) Prnthemis 



Dorsal hooks more spinelike or low and blunt; lateral 



setae of labium 6 to 10 11 



Dorsal hooks long and laterally flattened 12 



Dorsal hooks short and thick 14 



Abdomen broadly depressed, little longer than wide; 



lateral setae of labium 8 Tauriphila 



Abdomen about twice as long as wide 13 



Superior anal appendage, seen from above, slightly less 



than half as long as its basal width Brachymesia 



Superior anal appendage about twice as long as it.s 

 basal width; tip of hind wing case extends posteriorly 

 about halfway across abdominal segment 6 (fig. 4:13e) 



Cannacria 



Teeth on opposed edges of lateral lobes of labium large 



15 



Teeth on opposed edges of lateral lobes of labium 

 obsolete; lateral setae 6-7; mental setae 9 . . .Dythemis 

 Lateral setae of labium 6; mental setae 9-10 



Macrothemis 



Lateral setae of labium 7 to 9; mental setae 14-15 



Brechmorhoga 



Postocular distance less than the length of the eye 

 when viewed from above; eyes large and prominent on 

 an usually triangular-shaped head (fig. 4:10,9-;') .... 17 

 Postocular distance equal to or greater than the length 

 of the eye when viewed from above; eyes usually small 



and not very prominent (fig. 4: 10a, b, c) 23 



Lateral anal appendages nearly as long as superior 



appendage; lateral setae 6 or 7 18 



Lateral anal appendages usually about half the length 



of the superior appendage; lateral setae 7 to 14 19 



Abdomen with lateral spines on segment 9 one-third 

 as long as that segment; dorsal hooks present on 

 segments 5 to 8, those on 7 and 8 not prominent .... 



Dorocordulia 



Abdomen with lateral spines on segment 9 one and one- 

 half times as long as that segment; dorsal hooks 

 present on segments 3 or 4 to 8 increasing in size 



posteriorly Miathyria 



Dorsal hook present on segment 3; inferior anal append- 

 ages subequal in length to superior appendage 20 



Dorsal hook absent on segment 3; inferior anal append- 

 ages markedly longer than superior appendage (except 



in Sympetrum costiferum) 22 



Dorsal hook present on segments 2-6; lateral setae 



7 to 9 Paltothemis 



Dorsal hook absent on segment 2 21 



Mental setae 10-15; lateral spine on segment 9 less 

 than middorsal length of segment 9; lateral setae 9-12 



L eucorrhinia 



Mental setae 16-17; lateral spine on segment 9 greater 

 than middorsal length of segment 9; lateral setae 10; 

 dorsal hooks present on abdominal segments 7 and 8 



Macrodiplax 



Lateral spines of abdomen long and straight, those of 

 segment 9 extending to or beyond the tips of the inferior 



anal appendages Celithemis 



Lateral spines of abdomen short, not reaching tips of 

 anal appendages, curved toward meson (fig. 4:13/) 



Sympetrum (in part) 



Inferior and superior anal appendages subequal in 

 length 24 



