486 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol, XX VILLI. 
Neur., 15 (1870); Kirby, Syn. Cat. Neur. Odon., 88 (1890); Bath, 
Handbook Brit. Drag. p. (1890); Lucas, Brit. Drag. p. 177 (1900) 
Martin, Cat. Coll. Selys, Msch. xix-xx. p. (1909) ; Laid., I. c. p. 88 
4ischna mixta, Hagen, Ent. Ann., 52 (1857). 
Libellula coluberculus, Harris, Expos. Eng. Ins. 91, t. 27 £. i. (1782). 
schna coluberculue, Kirby, Cat. Odon., (1890). 
“Eschna affinis, Steph., Illus. Brit. Ent. Mand., vi., 85 (1830); Evans, 
Brit Lib., 22 t. 12 f. 2 (1845). 
schna alpina, Selys, Rev. Odon.* 125 (1850), id Rev. Zool , (1848) p. 16. 
Male. Abdomen 45 mm. Hindwing 38 mm. 
The name “ coluberculus’’ has priority of claim but as there is considerable 
doubt as to whether Harris description was intended for “ miata” or ‘ juncea” 
it seems better to adhere to “‘ mixta,” a name which has come into general usage. 
Head: Labium ochreous ; labrum greenish yellow surrounded with a border 
of black; epistome and frons greenish yellow, the upper surface of the latter 
marked with a black ““T”’ mark. In front of the eyes is a black line confluent 
with the stalk of the “T” ; vesicle and occiput yellow; eyes broadly conti- 
guous, deep blue in the living state. 
Prothorax dark brown, yellowish at the sides. 
Thorax brown marked in front with a vestigial spot of yellow on each side, 
the rudiment of an antehumeral stripe and on the sides by two broad, oblique 
stripes of bright yellow. The tergum spotted with yellow at the bases of the 
wings and in the middle line. 
Legs robust, black. 
Wings hyaline, costa brown, neuration black; stigma dark brown, 3-5 mm. 
in length ; membrane white bordered with greyish, of moderate size. 
Abdomen tumid at the base, constricted at the 3rd segment and then of uniform 
width and cylindrical to the end, dark brown spotted with blue and yellow as 
follows ;—1st segment brown on the dorsum, yellow on the sides, 2nd segment 
with a narrow triangular, bright yellow mark on the basal half of the dorsum, 
2 narrow, linear, transverse streaks at the middle, separated by but not confluent 
with the first marking, apical half of the segment blue changing to yellow on the 
sides, 3rd to 8th segments with 2 transverse streaks of blue about the middle of 
segments separated by the dorsal carina, on the sides an elongate spot of blue 
extending from the base for about two thirds the length of the segments, apically 
large, dorsal, subtriangular spots of blue. 
On segment 8 the lateral spot is very small, segment 9 has the apical spot but 
not the other two, segment 10 has a lateral, squarish spot of yellow. 
Anal superior appendages dark brown, flattened, sublanceolate, curled cork- 
screw fashion, pointed at the end, coated with long hairs at the apical half. 
Inferior pale yellowish brown, narrow, curling strongly up at the end, about four- 
fifths the length of the superior. 
Female somewhat similar to the male, differing as follows :— 
Abdomen 48 mm. Hindwing 38 mm. : 
Labium, labrum and face brownish yellow ; eyes greenish instead of blue. 
Wings rounded at the anal angle. Abdomen more tumid at the base, not con- 
stricted at the 3rd segment. 2nd segment without the blue on dorsum and 
the spots on other segments greenish yellow instead of blue. 
Anal appendages long, lanceolate, blunt at the end, without the hairy coating 
except for the marginal fringe. Dentigerous plate short, its posterior border 
quite straight, coated with minute, black denticles. 
‘ 9-15 | 15-8 9-15 | 14-8 
Nodal index -—i9.9 | 9-10 9-9 | 9-9 
4 to 5 cubital nervures in both wings, 8 cells in the loop, hypertrigones traversed 
once or twice in both wings. 
trigones rather short, 4 cells in all, 
