I^UIAX DRAG ON FLIES. ^b^ 



Heaa : eyes reddish brown above, puce coloured at the sides and 

 beneath, occiput ochreous, vesicle, frons and face brownish red, labrum 

 and labium golden yellow. 



Prothorax golden yellow. 



Thorax reddish brown above, golden yellow at the sides. Legs bricrht 

 ochreous. 



Abdomen reddish brown on the dorsum, golden yellow laterally, the 

 borders dark reddish brown and the distal borders ot segments dark brown. 



Wings rich golden yellow from the base to a little more than halfway 

 between the node and stigma, from which point it slopes steeply back to 

 reach the termen at the 6th nervure. The outer borders of this basal area 

 suffused broadly with brown as far as the tornus, but with an interruption 

 at the apex of the loop in the hindwing and the whole of termen in the 

 frontwing, from the level of the inner end of the bridge to the tornus. The 

 area external to this hyaline, except for the extreme apices of wingp which 

 are tipped with brown and suffused with saffron for a narrow extent. 

 Stigma reddish brown. Reticulation in the coloured area bright yellow. 

 Discoidal field contracted in the forewing, 5 to 8 rows of cells, 8 rows 

 of cells between o and oa, 3 rows of cells between 7 and 7«, basal re- 

 ticulation in the hindwing of male much closer than that in the female. 



Sexual organs very small, lamina depressed, broadly arched, external 

 tentacuhe broad and rounded, internal tentaeuke small, outwardly 

 directed hooks, lobe very small, strongly arched and tapering. 



Anal appendages as long as the 9th segment, spined beneath, ochreous. 



P^emale very similar to the male but the coloured area in both wings, 

 rather smaller and brighter in colour. The apices of the wings diffusely 

 brown as far as the inner end of the stigma. In juvenile specimens. 

 the bordering of the coloured area is merely a deeper yellow than the 

 rest instead of brown or there may be some small diffuse spots along the 

 hinder margin. Reticulation, especially in the basal area, much more 

 open than in the male. 



Sexual organs : border of the 8th segment not dilated, 8th ventral 

 plate not prolonged greatly but at its end, split into small, tumid, rounded 

 processes,. 9th ventral i^late tumid, broad, and furnished with two small 

 pointed processes near its base. 



Hah. Burma. 



The formation of secondary reticulation as seen in this insect and in 

 species of Xeurothemis, etc., is evidently due to sexual selection, as it is 

 much more pronounced in the male than in the female. I do not think 

 that sufficient stress has been laid on the inflxience of this factor, the 

 study of which may throw considerable light on several anomalies in the 

 neuration map of the dragonflies wing. In these species, we find two 

 influences warring against each other, one tending to simplify the neuration 

 by reduction and the other tending to complicate and increase 

 it. The construction of a colour scheme in which the basis is a network 

 of fine golden or crimson threads can only be brought about bj^ an increase 

 in the neuration. 



73. Camacinia harterti, Karsch, Berlin Ent. Zthr., 33, p. 359 (1890)- 



Kirby, Cat., p. 177 (1890)— Kruger, Stett. Ent. Ztg., 63, p. 107 (1902). 



Camacinia harmandi, Martin, Bull. Mus. Hist. Nat., 1900, p. 103 — 



Id., Miss. Pavie (p. 4 sep.) (1904)— Id., Bull. Soc. 



Ent. Ital. 60, p. 196 (1908). 



Expanse 90 to 95 mm. Length 44 to 48 mm. 



Head : eyes reddish brown above, paler at the sides and beneath, 

 vesicle, frons and upper epistome reddish brown, labrnm and labium 

 ochreous, somewhat darker over the lateral lobes, occiput brown. 



