THE CANADIAN ENTOMOLOGIST. 45 



notes I had made some time previously, but forgotten, with regard to the 

 ist instar of Sesia ( Macroglossa) stellatarum, caused me to doubt the 

 correctness of our conclusion, and the opportunity of examining larvae of 

 Bemaris tityiis (bomhyliforini:) and Hyles ( Deilephila) eiiphorbice in 

 their first skins has proved to me that Dr. Dyar's view is undoubtedly 

 correct. In its first instar, the larva of Sesia stellaiarmn has tubercle v. 

 on the first abdominal segment below the level of the spiracle, although 

 still at a higher level than iv. It is definitely situated on the lateral 

 flange, which on this segment bends upwards towards the anterior margin. 

 Much the same condition also obtains in the same segment in Hemaris 

 tityus, V. being on the lateral flange in front of iv. and below the level of the 

 spiracle ; while \\\ Hyles eiiphorbite iv. and v. on the first abdominal segment 

 are consolidated at base, the two setai being a very short distance apart 

 and both rising from a small oval plate beneath the spiracle. 



The next point raised is with regard to the union of tubercles iv. and 

 v., or, more correctly speaking, their inclusion within the limits of a group 

 of hairs on a raised skin area or wart beneath the spiracle, on the larva of 

 Lasiocampa querais and Pachygastria trifolii. This union or inclusion 

 is a condition which, as Mr. Dyar himself has shown, is of not infrequent 

 occurrence in some groups of Lepidoj^tera, and is met with in many 

 different stages of development, e. g., from the condition obtaining 

 in Anthrocera (Zygoma), where, in the second stadium, iv. and v., without 

 becoming appreciably nearer together than they were in the ist larval 

 stage, are surrounded by an irregular group of secondary setae, the whole 

 group being situated on a slightly-raised skin area, to the definite sharply 

 outlined and more or less raised wart, a condition such as obtains in 

 Saturniids or certain larviB of the Pterophorina. In at least one species of 

 the latter group (I think Mai-asmarcha phceodaciyla is an example) this 

 inclusion of iv. and v. is beautifully demonstrated owing to the primary 

 setae having black bases, while the secondary setae have pale ones. Now 

 Dr. Dyar, without directly contradicting such an union or inclusion of iv. 

 and V. within the limits of a single subspiracular wart in Pachygastria 

 trifolii, calls it in question, and I would ask if he has examined the larva 

 of this species in its first instar. Fortunately, I have by me specimens of 

 this larva roughly mounted for the microscope, and I have carefully 

 re-examined the same, and can find only the three many-haired warts 

 mentioned near the spiracle, viz., iii. above it, the accessory perpen- 

 dicular, and the subspiracular wart which I take to contain within its 



