364 Annals of the South African Museum. 



SiiJstedt's (later) descriptions of A. Rileyi. Nevertheless the present 

 specimens are smaller than the smallest dimensions given for A. Bileyi, 

 and I have before me a single female (head lost) of an Aeschna from 

 Kapiri, Katanga (Mas. Tervueren, collector Legros, x . 1912), which 

 seems to be specifically distinct from the pair above described and 

 may be the true A. Bileyi. 



It differs by the following points : (1) Considerably larger {abd. 

 51 + b,hdw. .lO, pt. 4), and much more robust in thorax and abdomen; 



(2) lateral bands of thorax narrower, ochreous line at humeral suture 

 and yellow transverse mark in front of antealar sinus absent ; 



(3) menibrauule wholly dark grey. 



Aeschna minuscula (MacLachlan, 1895). 



S. Afr. Mus. : 2 ? (old specimens, not dated) ; 1 9 . M'Fongosi, 

 Zululand (i. 1912, W.E. Jones) ; Nurugas,Tsintsabis, and Otjiwarongo, 

 S.W. Protectorate (i . 1920, Tucker). 



9 . Labium ochreous. Labrum, face and frons anteriorly dull 

 ferruginous. Postclypeus laterally, frons laterally and above light 

 yellow. A narrow Viiack line at base of frons, descending along the 

 eyes ; broadly fused to this line a medial black spot, abruptly contracted 

 anteriorly to join a transverse black line on the frontal ridge, thus 

 forming a T-shaped spot. Vertex yellow above, black in front. 

 Occipital triangle light yellow ; occiput black. Thorax light golden 

 brown. Yellowish green, narrow, almost complete ante-humeral 

 bands, nearer the median than humeral suture, slightly convergent 

 dorsally. Two very broad (1'6 mm.) lateral bands yellow, shading to 

 greenish dorsally, lined with darker colour in ventral half ; anterior 

 one in middle of mesepimeron, posterior one slightly in front of middle 

 of metepimeron. Legs black, basal half of femora ferruginous. 



Abdominal segments 1-2 much inflated, 3-5 gradually contracted, 

 6-10 cylindrical. Ferruginous with light yellow and blackish 

 markings : broad latero-ventral longitudinal bands on segments 1-2, 

 narrow mid-dorsal line on 2 ; 3-8 basal ventral spot of nearly one- 

 half the breadth and two-thirds the length of each segment, this spot 

 pointed behind and narrowly lined with black on ventral, broadly on 

 dorsal side, yellow ; 3-7 small yellow spot behind transverse carina ; 

 the carina lined with black ; 9 latero-dorsal, triangular yellow spots 

 pointed posteriorly ; 10 yellow, except a narrow dark median and 

 basal line. Appendages very short, ferruginous. Posterior half of 

 tenth ventral plate densely covered with minute black spines. Valvae 

 obtuse, short, projecting but little behind the end of tenth segment 



