246 MAINE AGRICULTURAL EXPERIMENT STATION. IQIO. 



Antenna with I, II, III dark, and IV, V, VI with proxmal por- 

 tion white and distal portion dark. Imbrication and sensona as 

 in alate form. I, 0.15 mm.; II, o.io mm.; Ill, 0.87 mm. ; IV, 

 0.54 mm.; V, 0.45 mm.; VI (base) 0.22 mm., spur 0.24 mm. 

 Prothorax and thorax brown. Legs brown. Abdomen spiny, 

 brown with darker transverse bands. Cornicles as in alate vivi- 

 parous form. 



The nymphs are brown and thickly beset with spines. Color 

 notes from live material. Measurements from balsam mounts. 

 Maine collection numbers 41-08, 61-08. 



1837. Aphis oblonga von Heyden, Entomolog. Beitrage in 

 Senckenberg. 



1843. Aphis oblonga. Kaltenbach Pflanzenlause, p. 133, species 101. 



1844. Aphis oblonga. Ratzeburg. Forstinsekten III, p. 219. 



1848. Aphis oblonga. Walker. Descriptions of Aphides. Ann. and 



Mag. Nat. Hist. Ser. 2. 



1854-1857. Callipterus oblongus. Koch Pflanzenlause, p. 219. Figs. 

 292, 293, 294. 



1894. Symdobius oblongus Mordwilko. Rab. Lab. Zool. Kab. Varch. 



Univ. (K. Faune Anat. sem. Aphid) p. 54. 



1895. Lachnus (Callipterus Koch) oblongus. Judeich und Nitsche. 



Forstinsektenkunde. (Mere mention) p. 1211. 



MASTOPODA PTERIDIS Oestlund. 



Since this curious species was recorded in 1886 from Minne- 

 sota, no account of a second collection has been published. It 

 is interesting in this connection to include a brief description of 

 the apterous form which the writer collected from brake fern 

 near Orono, August 6,- 1906. This was kindly determined for 

 me by Professor Oestlund. 



Apterous viviparous form: Head and thorax yellowish 

 white, eyes dark. Antenna about the length of body with I, II 

 and proximal half of III white, rest dark. Antenna 5-jointed 

 (6 if spur is counted as distinct joint as in original description). 

 I, o.i mm.; II, 0.07 mm.; Ill, 0.55 mm.; IV, 0.25 mm.; V, 

 (base) o.io mm. (spur) 0.65 mm. Ill without sensoria. IV 

 with single large sensorium at distal end. V with usual sen- 

 sorium at base of spur. Ill, IV, V imbricated. The legs are 

 the most characteristic part of this species, the tarsi being 

 atrophied. Abdomen is yellowish white with dark scrawls and 

 tracings. At base of cornicle is a round bright orange spot 



