204 ECONOMIC ENTOMOLOGY 



Adults appear and eggs are laid in July. There is but one brood each 

 year. 



Forest Tent-caterpillar (Malacosoma disstria Hbn.) differs from the 

 preceding in the following particulars: egg-mass is nearly square at 

 the ends; caterpillars do not construct tents; line along the back 

 is broken with dots; transverse lines on the wings of moth are darker 

 than ground color. 



Parasites. — Pimpla conqiiisitor, P. inquisitor, Tachina mella, 

 Anomolon exile. Calosoma and Podisus are predaceous enemies. 



Control. — Destroy the egg-masses; spray caterpillars with arseni- 

 cal; burn off the tents; band trees with burlap or tar to prevent the 

 caterpillars from ascending. 



GROUP GEOMETRINA (GEOMETERS) 



Chief Families (after Comstock) 



A. Media2 of the hind wings wanting, being represented merely by a fold in the 

 wing. — Ennomidce. 

 , AA. Media2 of the hind wings present. 



B. Mediaa of the hind wings arising much nearer to Mediai than to 

 Medias. 



Wings usually green. — Gcometridce. 

 BB. Media2 of the hind wings arising nearly midway between Mediai 

 and Medias or nearer to Mediaj than to Mediai. Wings rarely green. 

 C. Subcosta and Radius of hind wings extending distinctly separate 

 from each other, except that they are connected by a cross vein 

 near the middle of the discal cell. — Hydriomenida. 

 CC. Subcosta and Radius of hind wings approximated or coalesced for a 

 greater or less distance. 



D. Subcosta and Radius of the hind wings closely approximated 

 but not coalesced along the second fourth (more or less) of 

 the discal cell. 

 E. Radius and Mediai of hind wings separating at or 

 before the apex of the discal cell. — Ennomidce. 

 EE. Radius and Mediai of hind wings coalesced for a 

 considerable distance beyond the apex of the discal 

 cell.— Alonocteniida;. 

 DD. Subcosta and Radius of the hind wings coalesced for a short 

 distance near the beginning of the second fourth of the 

 discal cell, thence rapidly diverging. — Sterrhida. 

 DDD. Subcosta and Radius of the hind wings coalesced to or 

 beyond the middle of the discal cell. 

 E. Fore wings with one or two accessory cells. — 

 Hydriomenida. 

 EE. Fore wings without an accessory cell. — Monodeniida. 



