THE CANADIAN ENTOMOLOGIST 131 



ON THE MALE AND IMMATURE STATE OF GRYLLOBLA TTA 



CAMPODEIFORMIS WALKER. 



BY E. M. WALKER, TORONTO. 



The remarkable Orthopteroid insect described by the writer as Grylloblatta 

 campodeiformis^ has been hitherto known only from the type and paratype 

 specimens, both of which are mature females. Through the kindness of Dr. C. 

 Gordon Hewitt, Dominion Entomologist, who visited Banff, Alberta, the type 

 locality, in 1916, I have had the privilege of examining seven additional speci- 

 mens, including a mature male, two mature females and four nymphs, of which 

 three are males and one is a female. 



One of the adult females was taken by Dr. Hewitt, in company with Mr. 

 N. B. Sanson, Curator of the Rocky Mountains Park Museum, and is well 

 preserved in alcohol. The other specimens were dried and were found in the 

 collection of the Rocky Mountains Park Museum, with the exception of one 

 male nymph, also dried, from the National Collection. All were taken in the 

 vicinity of Banff, the labels giving the following data: — 



"Sulphur Mt., Lab. No. 50, July 18, 1916." (Adult female). 



"Sulphur Mt., Oct., 1908, N. B. Sanson." (Adult female). 



"Sulphur Mt., Nov. 21, 1910, N. B. Sanson." (Adult male). 



"Sulphur Mt., Nov. 21, 1910, N. B. Sanson." (Male nymph, stage A). 



"Sulphur Mt., top of trail, on snow, Jan. 24, 1910, N. B. Sanson." (Male 

 nymph, stage B). 



"Banff, Nov. 5, 1906, N. B. Sanson." (Male nymph, stage B.) 



"Sulphur Mt., trail, Nov. 9, 1915, N. B. Sanson." (Female nymph). 



Since the original description of this insect was published several papers 

 by Professor G. C. Crampton have appeared, in which its structure and affinities 

 have been discussed at some length. He has dealt chiefly with the thoracic 

 and cervical sclerites,^ the antennae^ and to some extent with the female genitalia.* 

 The latter have been fully investigated by the present writer, and will be de- 

 scribed in a paper on the terminal abdominal structures of Orthopteroid insects, 

 which it is expected will appear in the near future. 



The present paper will be chiefly confined to a description of the adult 

 male and the immature stages of both sexes, as represented by the material at 

 hand, a full discussion of the phylogenetic relations of Grylloblatta being re- 

 served for the future paper just mentioned. 



It will be convenient to describe the adult male first, then the immature 

 stages of the male and female, respectively. 



The Adult Male. 



The adult male measures 16.5 mm. in length, and is similar to the female 

 in every respect, except the terminal abdominal segments and genitalia. 



The 8th segm.ent shows no special features, being similar to the 7th and 

 other typical abdominal segments. The 9th segment, on the other hand, is 

 very remarkable. It is of considerable size, larger than that of the female, and 

 about equal in width to the 8th segment. The tergite (PI. VIII, Fig. 1) is about 

 twice as broad as long, with a slightly and somewhat irregularly arcuate hind 



 1. Walker, E. M., Can. Ent., 1914, vol. XLVI, pp. 93-99. 



2. Crampton, G. C, Ent. News, 191.i, vol. 26, pp. 337-.3.50. 



3. Crampton, G. C, Can. Ent., 1917, vol. 49, pp. 213-217. 



4. Crampton, G. C, Journ. N. Y. Ent. Soc, 1917, vol. 25, pp. 25-237. 

 June, 1919 



