1899.] NATURAL SCIENCES OF PHILADELPHIA. 267 



mentum broader thau long, breadth 104, length 92 p.; legs very 

 sparsely hairy ; hairs on tibia and tarsus very short ; claws simple, 

 ordinary. Bristles of anal ring 108 ,a long. 



The following measurements of the legs and antennae are in ,v. : 



Antennal segments: (1) 52, (2) 44-48, (3) 28-32, (4) 20-24, 

 (5) 32, (6) 22-24, (7) 28-32, (8) 76-88. Formula 812 (537) 

 (64). 



Middle leg: coxa, 116; femur + trochanter, 240; tibia, 168; 

 tarsus, 84; claw, 22. Diameter of femur, 72; of tibia, 36. 



Anterior leg: tibia, 140 ; tarsus, 80. 



Posterior leg : tibia, 200 ; tarsus, 92. 



Larva. — Dactylopiine ; antennae 6 -segmented, 6 longer than 

 3 + 4+5, as 13 is to 10|^; tarsus, excluding claw, longer than 

 tibia, as 11 is to 10; caudal tubercles slightly produced; mentum 

 not very long, length to breadth as 11|^ is to 10. 



Hah. — Washington, D. C, on ash, November 4, 1898 {Per- 

 gande, Div. Ent., No. 8,200). Differs from P. jicri-isii princi- 

 pally by its smaller size, scarcely pubescent legs, and in being 

 arboreal, whereas jaerrmi was found on grasses. Its color is also 

 different. This interesting insect ought to have been published 

 under Mr. Pergande's name, as he had carefully examined it and 

 noted its peculiarities before I saw it. It is only after urging him 

 to publish it, without result, that I now, with his consent, make it 

 known. I am permitted to supplement my description by the 

 following extract from Mr. Pergande's notes: 



" Found in cracks of bark on the trunk of an ash on the Agricul- 

 tural Department grounds three specimens of a species of West- 

 woodia, one of them still crawling about. The others were infested 

 by a hymen opterous parasite, though both were still living. The 

 active ? was very slender, about 4 mm. long, by 1 mm. in diame- 

 ter, and of a brownish-red color but covered with a mealy excre- 

 tion Avhich gave it a grayish or moldy appearance. The other two 

 were in addition to the mealy substance covered by a woolly excre- 

 tion, which was rather sparse anteriorly, but became very dense 



toward and around the end of the body There was also 



found in one of the cracks a mass of white and woolly excretion 

 containing eggs and young larvoe of this species, all of which were 



of a pale purplish color With the eggs were also found 



one minute specimen of a bright red species of Scirus, and one 



