120 THE GYPSY MOTH APPENDIX. 



with light brick red. Head much longer than wide, nearly trun- 

 cate in front. The lateral lobes in a few specimens I have ex- 

 amined are a trifle longer than the tylus, but this seerns to be an 

 exception ; outer margin of lateral lobes embrowned. Eyes very 

 dark brown ; ocelli minute, near occiput. First segment of au- 

 tennffi very short, hardly reaching lateral margin of head ; second 

 segment slender, relatively short, but little over three times as 

 long as first ; third segment about three-fourths as long as second ; 

 fourth segment nearly as long as second ; fifth segment longer . 

 than third, but a little shorter than fourth ; all joints reddish or 

 pale brown. Rostrum stout, reaching upon, sometimes to, pos- 

 terior margin of hind coxa? ; second segment the longest, third 

 and fourth of equal length, the latter dark reddish brown. Pro- 

 notum deeply indented at the sides, margined with a fine yellowish 

 white line, within which the puncturing is densely massed ; an- 

 teriorly on the lateral margins there are several minute teeth ; 

 prouotal callosities obscure, thickly punctate outwardly. At the 

 humeral angles the punctures are massed into a reddish spot, the 

 angles being acute but not spiuose. Scutellum sinuate, bare at 

 apex, which reaches to the membrane ; in nearly all specimens 

 examined there is a minute bald spot at each basal angle of 

 scutellum. Coriurn and embolium tinged with scarlet at their 

 junction with membrane, which is bronzed and bears a dark-green 

 marking at the tip. Under-surface pale yellowish, punctate with 

 red, and bearing a row of four minute dots on the median line and 

 two rows of similar dots laterally. Ventral spine very short, not 

 reaching hind coxre. Legs rufous. 



Distribution. Canada, Maine, Massachusetts, New York, 

 Illinois, Georgia, Dakota, Nebraska, Colorado, Mexico. 



The only species resembling P. modestus is the light 

 variety of P. serieventris, which sometimes approaches the 

 darker forms of the former species. The deeply sinuate 

 humeral angles, the red marking at the tip of the cerium, the 

 light-colored tergurn, the short ventral spine and short sec- 

 ond segment of antennae, -- are characteristic of modestus, 

 and will serve to distinguish it. 



Habits. 



This species is very common in May, feeding on tent 

 caterpillars ( Olisiocampa americana Harr. ) . At the Museum 

 of Comparative Zoology, Cambridge, there are several speci- 

 mens which were found under leaves by Mr. Jacob Boll in 



