THE CANADIAN ENTOMOLOGIST. 227 



Valley of the River Rouge, gives sca/aris as •' abundant on alders through- 

 out the district, from the end of June to the end of September," but says 

 nothing oi labyriiitJiica. Mr. Ritchie gives both scalaris7vc\^ lahyrinthica 

 in his Montreal List, but without dates. 



In September, 1883, I found scalar is in great numbers in the crevices 

 of the bark of elm trees at Cote St. Paul, about a mile from the locality 

 where I find lobyrinthica. I examined several trees and could have taken 

 scores of sca/aris, but did not see a single specimen of the other form. 



Physojiota unipuncta, Say. In the July number of the Can. Ent., 

 Mr. Hamilton asks for information concerning this insect. I find the form 

 helianthis Rand. (3 black spots on thorax) common on what I take to be 

 the wild sunflower ( Hc/iatithus). It is double-brooded, occurring in June 

 and again in August, but the broods when living present a very different 

 appearance. The beetles of the first brood are entirely of a burnished 

 gold color, and are exceedingly beautiful. The fall brood show no trace 

 of the gold, and answer to Randall's description as quoted by Mr. Ham- 

 ilton, except that I would call them blackish-green, etc. After death both 

 broods fade to a dingy yellow, and are then exactly alike. I found what 

 I took to be the larva common on the same plant, but did not make a 

 description of them. As well as I can remember, they were different from 

 those found by Mr. Hamilton. They were dark green in color, the margin 

 not serrate or spined, and the tail, instead of being bifurcate, ended in a 

 knot. They fed in company, and were constantly wet with semi-fluid 

 excreta. As I did not pay much attention to them, the mature larvje may 

 have escaped my notice, and may have been similar to those found by 

 Mr. Hamilton. I have not seen Randall's description, and do not know 

 if he mentions the difference in color in the broods. In this locaHty all 

 the beetles of the first brood were golden, and all of the second were 

 blackish green, with yellowish white spots. Both beetles and larvae were 

 very sluggish. 



[Read before the Montreal Branch, nth Nov., 1884.] 



THE PROPORTION OF THE SEXES IN CICINDELA VUL- 

 GARIS, Say, and OTHER NOTES ON THE SPPXIES. 



BY C. H. T. TOWNSEND, CONSTANTINE, MICH. 



The proportion of the sexes in insects often throws much light upon the 

 habits and appearance of the species. Having had good opportunity to 



