334 THE CANADIAN ENTOMOLOGIST 



mainland. The island had an area of about three acres, and was 

 almost smooth, bare granite. On top was a pretty lagoon, mar- 

 gined with water plants, shrubs and a few small trcos. Images of 

 Blasturiis nebulosus were dancing over this pond in the sunlight, 

 about 3 p.m., matings frequently occurring. 



Nymph : 



Measurements — Body 9.5-10 mm.; setae 7-10 mm. General 

 colour blackish brown. Head brown, with a dark area behind 

 middle ocellus and between the lateral ones; black, scroll like 

 markings between the eyes. Pronotum has a small light spot on 

 each side, close to median line and near anterior margin; posterior 

 to this and farther from median line is another larger oval light 

 spot, and lateral to this again is an elongated Hght area; the 

 rounded lateral margin is colourless. Abdomen is blackish brown, 

 with light brown markings; segm.ents 5 or 6 to 10 have a light me- 

 dian longitudinal stripe; on each segment is a slightly elongated, 

 incurved small light spot on each side of m.edian line toward the 

 anterior m.argin of the segm.ent; posterior and more lateral is 

 a larger round light area, which usually disappears on segm.ents 

 8, 9 and 10. Ventral surface is light brown, with three faint dark 

 longitudinal lines, one m.edian and two lateral; on each side of the 

 median line in each segment is a very small white oblique line near 

 anterior margin, and posterior to this is a small light dot. Median 

 seta shorter, slenderer and lighter in colour than lateral ones. All 

 fringed with hairs at joints. Legs light brown; posterior margins 

 of tibia? and tarsi fringed with hairs, and anterior margins covered 

 with serrated teeth; inner margins of claws with rows of teeth for 

 their entire lengths. 



Up to the present time I have not been able to find any ap- 

 parent differences between the nymphs of these two species of 

 Blasturiis. 



Choroterpes {?) basalis Banks. 



Large numbers of the nymphs of this species were found in a 

 small stream July 30th, clinging to the lower sides of stones in the 

 quiet water. The next day several subimagos emerged from this 



