l8o ENTOMOLOGICAL NEWS [April, 'lO 



translucent ; head small, in color like thorax ; true legs black, 

 prolegs short, yellowish. As a whole the caterpillar is rather 

 slug-like. The first seven abdominal segments have each a 

 pair of clear yellow, ellipsoid, semi-lunate spots, bearing tu- 

 bercles and spines, these spots being arranged in a double row 

 along the dorsum.' There is a second row of tubercles and 

 spines midway between median line and the spiracles. 



Pupa is 13 to 15 mm. in length, 3 to 5 mm. in diameter over 

 thoracic and abdominal portions respectively, slightly pitted. 

 When larva-skin is first cast the pupa is of same color as 

 larva, preserving the two rows of bright yellow spots now 

 much more quadrate. In a short time the general color be- 

 comes much more mahogany brown and the whole surface 

 except for the rows of spots mentioned, is thickly sprinkled 

 with black dots. Two days before emergence the wing covers 

 become dull black, heralding the approach of the final change. 

 The pupa is suspended by a band of silk fastened on the back 

 at base of thorax, extending to a point opposite the head ; ab- 

 domen free, not attached. These pupae can be seen fastened 

 to the food plant and also to every plant within 15 inches of 

 the ground. Pupal period, 20 to 22 days. 



No opportunity presented itself to secure an identification 

 of the food-plant, owing to my very hurried work. I spent 

 about half an hour and secured the larvae mentioned together 

 with 35 imagoes. 



A New Gall-making Psyllid on Hackberry. 



BY T. D. A. COCKERELL. 



Pachypsylla rohweri n. sp. 



Structure and venation as in P. ccltidis-mamma Riley, but anterior 

 wings milky-hyaline, with pale yellowish veins and brownish-black mark- 

 ings, consisting of numerous scattered dots, a large irregular spot or 

 patch just below the origin of the radial sector, an oblique band begin- 

 ning at the end of the stigma and passing downwards and inwards, to 

 end in an enlargement between the branches of the cubitus, and finally 

 a broad band, on which are three hyaline spots, along the outer margin. 

 The area between the two bands may be regarded as a hyaline band 



