FOUR RARE APHID GENERA FROM MAINE. 245 



1901. Schisonettra pinicola Hunter. Aphid, of N .A. p. 83. Bib- 

 liography. 



1903. Schizoneura pinicola Clarke. List of Cal. Aphid. Can. Ent. Vol. 

 35. No. 9. Listed for California. 



1906. Schisoneiira pinicola Felt. Insects affecting Park and Woodland 

 Trees. 2 : 753. Mere mention. 



1909. Mindariis abictinus, Patch. Homologies of the Wing Veins of 

 the Aphididae. Ann. of the Ent. Soc. of Am. Vol. 11, No. 2. 

 pp. 14, 15. Figs. 18, 19, 20. Discussion of the tracheation and 

 venation of the wings. 



SYMDOBIUS OBLONGUS. 



On July 17, 1908, this striking species was collected at Orono 

 where it was found to be gregarious upon the branches of 

 birch (Befiila papyifcra Marsh). It occurred largely upon the 

 growth of the previous season, and was difficult to collect on 

 account of its tendency to drop from the branch at the slightest 

 jar. Nymphs, pupae, and apterous and alate viviparous forms 

 were taken in this collection. On August 20, 1908, a second 

 collection of the apterous viviparous form was collected from 

 the branches of birch {Bctiila papyifcra Marsh) where it oc- 

 curred in small colonies. The broad white bands on the dark 

 antennae and the heavy shadowing of the wing veins make this 

 a distinctive species. 



Alate viviparous foriti. Head brown with red eyes. Antenna 

 with I, II, III dark and IV, V, VI with proximal portion white 

 and distal portion dark making a distant and conspicuous band- 

 ing. I, 0.105 mm. ; II, 0.055 mm. ; III, 0.7 mm. ; IV, 0.45 mm. ; 

 V. 0.4 mm.; A'"I (base) 0.2 mm., (Spur) 0.2 mm. Notice that 

 the spur is very short. Ill, IV, V and VI are imbricated. 

 About 15 protruding sensoria occur in a row on III, single 

 large sensorium at distal part of Y. VI with usual scnsorium 

 at base of spur, and separate attendant sensoria. Beak extends 

 to second coxae. Prothorax and thorax brown. \\'ings with 

 brown veins heavily shadowed. Length of wing 2.95 mm. 

 Legs brown. Abdomen hirsute (spiny), brown with heavy 

 transverse bands of darker brown. Cornicles yellowish white. 

 short, broad, somewhat constricted at the middle, and with 

 flaring opening. Figures 215-219. Color notes from live ma- 

 terial. ]\Ieasurements from balsam mounts. iNfaine collection 

 number 41-08. 



Apterous I'iriparous form. LTcad dark l")rown with red eyes. 



