Oct.-Dec. 1921.] 



The Canadian Field-Naturalist 



129 



Family Ranidae. 

 Baxa pipiens Sehreiber. Not common. 



CLASS INSECTA 



Insects, while abundant on the island, 

 were not very common on the spit. Un- 

 fortunately, time did not allow the taking 

 of satisfactory notes, and also in several 

 instances the preservation was so bad as 

 to prohibit the accurate determination of 

 the species. Some interesting forms were 

 encountered. 



Order Odonata 

 Dragon flies were plentiful on the is- 

 land but the only species taken on the 

 spit was Nehalennki irene Hagen (B.P. 

 Currie, U.S. Nat. Mus.) 



Order Neuroptera 



The following were taken on the spit 

 but their faulty preservation did not allow 

 of an accurate identification. 



Limnephilidae. 2 species; Phryganea, 1 

 species; Ephemeiidae. 1 .species (immat- 

 ure) (A. N. Candel, U. S. Nat. Mus.) 



Order Orthoptera 



A number of grasshoppers were taken 

 but all of them were in an immature con- 

 dition and all belonged to the genus Mela- 

 noplus. They were kindly identified for 

 me by Mr. Norman Criddle of Treesbank, 

 Manitoba, as follows : 



Melanoplus atlantis, M. dawsoni and M. 

 femur rubrum or angustipennis. 



Order Hemiptera 



The following were taken : 



Capsus ater, adult and young ; Nabis sp. 

 nymph ; several specimens of family Corix- 

 idae not identified. (W. L. McAtee, Bio- 

 logical Survey, U. S. Nat. Mus.) 



Order Lepidoptera. 



Family Nymphalidae, Brenthis aphirape 

 va.r. dawsoni; Phyciodes tharos Drury; Ba- 

 silarchia dissipus Godart ; Basilarchia ar- 

 themis Drury var. lamina Fab, 



Family Papilionidae, Papal'O machaon 

 (L) var. aliaska Scudder. 



Familv Sphingidae, Smerinthus cerisyi 

 Kby. 



Family Noctuidae, Aerontjta {Apatela) 

 dactyliva Grote ; Hadena allecto. 



Familv Notodontidae, Phaeosia rimosa 

 Pask. 



Familv Geometridae, Rheumaptera has- 

 tata L. 



In additicn the larvae of Malasosoma 

 fragilis Stretch and a number of uniden- 

 tified Noctuids were collected. The stems 

 of a number of the Goldenrods were pa- 

 rasitised b}' Onorioschema gallaesolidogi- 

 nis Riley. 



Order Diptera. 



The Diptera were kindly identified for 

 me by Dr. J. M. Aldrich' of the United 

 States National Museum as follows : 



Tabanus af finis, Kirby ; Tabanus sep- 

 tentn'ionalis, Loew ; l\aematopota unieri- 

 cana, 0. S. ; Chrysops carbonaria, Walker; 

 (lirysops lupus, Whitney; Sphaerophoria 

 soipta, L. ; Phormia regina, Mg. ; Phor- 

 mia ierrae-novae, R. D.; Cynomyia cadave- 

 lina, R. D. ; Hylemyia tricho-daetyla, 

 Rond; Anihomyia radicum, L.; Lispa sp. ; 

 Spathiophora fascipss. Beck; Sciomyza 

 simplex, Fall; Camptoprosopella vulgaris, 

 Fitch; Dicraeus incongruns, Aid.; Anaros- 

 toma marginatd, Loew; Fu-cellia maritima, 

 Ilalliday; and a new genus and species of 

 the family Sapromyzidae. The Tipulidae 

 and Chironomidae were not well enough 

 preserved for identification. 



Dr. Aldrich has called attention to 

 several interesting forms in the foregoing 

 list. 



The fly Ilydrophorus agalma Wheeler is 

 of considerable interest ; it has only been 

 recorded so far from Battle Creek, Mich., 

 the type locality, and from Ridgeway, Ont. 

 It belongs to a very abundant family the 

 Dolichopodidae, whose larval stages have 

 up to the present almost wholly escaped 

 observation. In North America so far the 

 larval stage of only one species, Thryp- 

 tiens muhlenbergiae Johannsen, is known 

 and this is a stem-miner in plants very dif- 

 ferent from the present species. 



The specimens were taken in water only 

 a few inches deep on the north sid'e of the 

 spit where it joined the main ridge. The 

 bottom here is a mixture mainly composed 

 of sand with a little mud, and owing to its 

 sheltered position is practically undisturb- 

 ed. Unfortunately, owing to lack of time, 

 no satisfactory observations were made on 

 the life history of this form. The larvae 

 build for themselves cocoons of the sand 

 about 8 mm. long and in these also they 

 pupate so that the cocoons collected con- 

 tained both larvae and pupae. How or 



