110 



Smith and Pritchard: Odonata 



— Antenna 4-segmented (fig. 4:11c, d,e); fore and mid- 

 tarsi 2-segmented, the hind tarsus 3-segmented 



GOMPHIDAE^ 



4. Antennal segments short, thick, heavily setiferous 

 (fig. 4:116); abdominal segments 2 (or 3) to 9 with a 

 pair of laterodorsal tufts of long black bristles (fig. 

 4:12i) PETALURIDAE > 



— Antennal segments slender and bristlelike (fig. 4:11a); 

 abdominal segments without laterodorsal tufts 



AESHNIDAE _ 



5. Labium with large irregular teeth on distal edge of" 

 lateral lobe (fig. 4: HA); mentum with a median cleft 



CORDULEGASTRIDAE I 



— Labium with distal edge of lateral lobe entire or with 

 small, even-sized crenulations or teeth (fig. 4: Hi); 

 mentum without a median cleft LIBELLULIDAE 



6. Antennal segments approximately equal in length (fig. 

 4:14a); mentum entire (fig. 4:14/) or with a closed 

 median cleft 7 



— Antennal segments unequal in size, 1st segment as 



Fig. 4:10. Anisopterous naiads, a, Libellula; b, Plathemis; 

 c, Paltothemis; d, Somatochlora; e, Platycordul ia; f, Neoro- 

 cordulia; g, Tramea; h, Pachydiplax; i, Leucorrhinia, ;'. Celithe- 

 mi's; k, Basiaeschna; I, Nasiaeschna; m, o, Macromia; n, Ocfo- 

 gomphus; p, q, Epicordulia, dorsal and lateral views; a-n, dorsal 

 view of head; o, lateral view of head (Wright and Peterson, 1944). 



Fig. 4:11. Anisopterous naiads, antennae and parts of labium. 

 a, p, Aeshna; b, Tachopferyx; c, n, Dromogompnus, d, Ocfo- 

 gomphus; e, Progomphus; f, Boyerio; g, Basiaeschna; h, Cordu- 

 /egaster; i, Panfala; j, Tramea; k, Libellula; I, Epicordulia; m, 

 Plathemis; o, Coryphaeschna; q, Pachydiplax; o-e and q, anten- 

 nae; f-j, lateral lobe of labium; k-p, inner surface of mentum and 

 lateral lobes of labium (Wright and Peterson, 1944). 



