138 MARINE AND FISHERIES 



5 GEORGE v., A. 1915 



Female imago: 



Measurements : Body 10-12; wings 14-16; set® 22-25. 



Nymph: 



Measurements: Body 11-14 mm.; setse 12-16. 



Head deep brown, occasionally almost black dotted with light spots; three 

 light areas along anterior margin of head and one at posterior margin between 

 eyes. Pronotum similar in colour to head with light dots and about 5 larger light 

 areas on each side; lateral margin with a light area which extends in some distance. 

 A light area in antero-lateral angle of mesothorax. Femora stout with 5 irregular 

 light areas; small spines very numerous; posterior margins fringed with hairs. 

 Tibise with 2 dark and 2 light areas, arranged alternately. Abdomen similar 

 in colour to head and thorax; a light area on segments 4 and 5 containing a small 

 triangular dark area at anterior margin of segment 5, lateral to which are 2 dark 

 dots; another light area on segments 7, 8, 9 and 10 containing 2 dark dots on 8 

 and 2 on segment 9; usually the 3 dark spots at posterior margin of the segments 

 of the abdomen of the imago can be distinguished; ventrally two longitudinal 

 rows of dark dots, increasing slightly in size toward posterior end; segment 9 

 usually with 2 pairs, the anterior pair small, posterior pair larger. Setse with 

 alternate dark and light areas. Gills have the lamellae slightly rounded at distal 

 end. 



This species was by far the most abundant at Go Home Bay. The nymphs 

 were found in almost every locality where there was a stone to cling to, except, 

 of course, in stagnant water, and could be taken at any time during the three 

 months. The first specimens bred emerged May 31, but the first capture was 

 not made until June 11. On this date a small swarm of about 20 individuals was 

 discovered about 8.15 p.m., flying from 10 to 20 feet high, facing north. One 

 female and several males were taken. Soon after this they became very abundant 

 and remained so until about July 5th. The last specimen bred is dated Aug. 13. 



Heptagenia rubromaculata Clemens. 



,, , . (PI. XVI, Fig. 2). 



Male imago: 



Measurements: Body 8 mm.; wing 8 mm.; setae 17 mm.; fore-leg 7 mm. 



No inarks on face; darker spot at posterior margin of head between eyes. 

 Thorax dark; median longitudinal dark stripe on pronotum; dark brown stripe 

 on coxa of fore-leg and extending up the side of prothorax. Abdominal segments 

 1-7 lighter; 8-10 dark, similar to thorax; each segment banded at posterior margin; 

 fitigmal dots distinct; wing has a reddish area in pterostigmatic space. 



Vemxile imago: 



Measurements: Body 9-9-5 mm.; wings 13-14 mm.; setae 15-22 mm. 



Often slightly reddish on face beneath antennae. Dark brown on dorsal 

 surface of head behind ocelli. Abdomen varies from a reddish to a yellowish 

 colour in dried specimens. 



