l8 MAINE AGRICULTURAL EXPERIMENT STATION. I9II. 



sparingly supplied with small setae, larger however than the 

 setulae of the supra-genital plate. 



The brown highty chitinized pointed tip of the ovipositor ex- 

 tends about to the tip of the supra-anal plate (sa) . Fig. 23 gives 

 a good lateral aspect of this segment. 



The color notes are from live specimens and the structural 

 notes are from balsam. 



Cot3'pes collected in June and July at Orono and Veazie, 

 Maine. (Lots 1232 and 1326 Sub. l). 



Triosa obtu'sa n. sp. 



This species was bred from nymphs developing on Amelan- 

 chicr canadensis (L.) Medic, the winged forms appearing July 

 6, 1910, and later. A male of the same species taken from 

 Amelanchicr is in our collection with the date August i, 1906. 

 In general coloration this species varies from pale green bodied 

 freshly molted individuals with colorless hyaline wings, to older 

 deeply colored individuals with bodies of ochre yellow and wings 

 very dark and smoky. The mesonotum is roundly pointed ce- 

 phalad and more elevated than pronotum. 



Head. The frontal cones are not vertical but are distinctly 

 visible from above. They are widely diverging, the mesal line 

 being convex and the lateral line concave. The tip is rather 

 acute. A dorso-cephalic aspect of the head (Kig. 29) shows 2 

 quadrate epicranial plates with a median suture between them. 

 All .3 ocelli are visible in this aspect. The antennae are short 

 and lo-jointed. IX, X and distal VIII are darker and some- 

 what broader than the preceding joints. IV, VI, VIII and IX 

 each bears a distal circular sensorium. Two very unequal setal 

 spurs terminate X, the shorter one being about half the length 

 of the longer and thicker. The antennal length is about 0.85 

 mm. 



JVings. Fig. 25 sufficiently represents the form and venation 

 of the fore wing. They are sometimes very dark and 3 char- 

 acteristic black dashes are present at the wing margin, one be- 

 tween the cubital branches, one betv/een the branches of media 

 and one between media and cubitus. The wing is roundly 

 pointed at the apex between the branches of media. The vena- 

 tion is a good Trioza type, the main vein branching into R, M, 

 and Cu at practically the same point. There is no stigma. The 

 wing length is about 2.63 mm. 



