INSECUTOR INSCITI^ M^NSTRUUS 113 



The egg is long, slender, spindle-shaped, a little flattened on 

 one side, shining black, laid singly. 



Eggs deposited about July 20 were allowed to dry and 

 water was added on August 2. The larvae hatched in consid- 

 erable numbers within 15 minutes after the addition of the 

 water. The habit is the same as with curriei and trivittatus, 

 part of the eggs hatching whenever submerged, and over- 

 wintering is not necessary for emergence. 



Consequently the larvae occur in irrigation pools, frequently 

 in large numbers. The larva (see Plate II) has the tuft of 

 the tube far out, beyond the pecten which runs nearly to the 

 end of the short tube; pecten with detached teeth outwardly; 

 anal segment ringed by the plate; comb-scales seven to ten, 

 in a patch, not in a line, the single scale with long sharp cen- 

 tral spine and fringe of a few slender ones at base; head hairs 

 both single, ante-antennal tuft in fours. 



Aedes fletcheri Coquillett. 



Superficially similar to nigromaculis, replacing it on the 

 prairies of Saskatchewan and Alberta. The coloration is the 

 same, but more yellowish in fletcheri, paler and sufifused. 

 There is no white ring on the proboscis, but this is also some- 

 times absent in nigromaculis. The species enters Montana at 

 the northern part, as our single record proves. Big Fork, Flat- 

 head County, 1904 (E. M. Ricker). Mr. Parker's specimen 

 seems not to have been preserved in the collection. I did not 

 meet with the species. 



Aedes riparius Dyar & Knab. 



A single specimen, Dillon, Montana, August 4, 1908 (R. A. 

 Cooley), in the collection of the National Museum, agrees with 

 this species. It is close to fletcheri in coloration, but differs in 

 the abdomen, which in riparius is lightly suffused with whitish 

 scales, in fletcheri strongly so. However, they differ in habit, 

 fletcheri being a prairie species, while riparius frequents the 

 timber along the river bottoms. I did not meet with this 

 species. Dillon is in the Beaver Head valley, a tributary of 

 the Missouri. The species ought, perhaps, to have been en- 



