January 1891.] 



PS T CHE. 



11 



Hylototna scafularis Klug. — The full- 

 grown larvae have a pretty general resem- 

 blance to those of H. fectoralis Leach (=H. 

 dulciaria Say),* and are about 18 mm. long. 

 Head light orange yellow, body somewhat 

 flattish and light yellowish green in color. 

 There are six distinct rows of small closely 

 adjoining black spots on the upper portion 

 of the body extending from the head to the 

 anal segment. On each of the fleshy projec- 

 tions on the sides of the segments, except 

 the last, there is an oblong dark spot; but 

 these spots above the two posterior pair of 

 true legs appear as two large somewhat tri- 

 angular black blotches. Above the anal seg- 

 ment there is a large oval shaped black spot. 

 The legs are black on the outer side, and the 

 prolegs are marked by a dark brown blotch 

 on the outer side. The black legs and black 

 blotch on the anal segment are the chief 

 marks which distinguish this larva from that 

 of H. fectoralis in which the legs and anal 

 segment are yellowish. The cocoons are of 

 a dirty white or light brown color and aver- 

 age about 12 mm. in length. They are com- 

 posed of two walls, the inner being closely, 

 and the outer loosely spun. 



The eggs are deposited along the margins 

 of the leaves of the common American elm 

 (Ulmus Americana) upon which the larvae 

 feed. Young larvae were found early in Au' 



gust and those observed attained full growth 

 about the end of the month. Two males 

 and many females were raised from these 

 about the first of July following. 



Hylotoma McLeayi Leach. Full grown 

 larva from 15 to 18 mm. long. Head black. 

 Body flattish ; pale yellowish green, with 

 four distinct lines of black spots along the 

 back extending from the head to the anal seg- 

 ment; and with some minute, less regularly 

 arranged spots or dots along the sides above 

 the fleshy projections which characterize lar- 

 vae of this genus. Each fleshy projection 

 bears a long narrow black spot. The anal 

 segment is surmounted by a large irregular 

 oval black blotch and is brown above the 

 anus The legs are dark brown or black on the 

 outer base and have a heavy black blotch at 

 the base. The prolegs are marked on their 

 outer side by a somewhat triangular, black 

 or very dark brown spot. The cocoon is 

 double walled, the outer wall being loosely 

 woven and it is dull white or pale brown in 

 color, and is from 12- 14 mm. in length. 



The larvae were found in considerable 

 numbers in the month of August feeding 

 upon the foliage of common choke-cherry 

 (Primus Virginiana) at Jamaica Plain, Mass. 

 From these larvae a number of female im- 

 agos were bred in the latter part of the 

 month of May following. 



A NOVEL DIAGRAMMATIC REPRESENTATION OF THE ORDERS 



OF INSECTS. t 



The difficulty of representing satis- i] shows by parallel bars rising above 



factorily by any linear arrangement the the circular plate, which represents the 



relations of the orders to each other surface of the earth, the sixteen orders of 



and to Thvsanura has compelled us to insects as they exist to-day, and below 



give diagrams I-III. Diagram II [pi. this plate the different orders are ar- 



* See T. W. Fyles in Canadian entomologist, v. 1S, t Reprinted from Guides for Science Teaching-. No. 



P.3S; v. 19, p. 59. VIII. Insecta. By Alpheus Hyatt and J. M. Anns. 



