14 
Hosts. Parasites. 
Pulvinaria sp. on plum Coccophagus flavoscutellum. 
Pseudococcus acei'is Coccophagns lecanii. 
Pseudococcus yucca' Perissopterus mexicanus. 
Prosopophora ou oottonwood Perissopterus pulchellus. 
Eriococcus azalea' Coccophagns immaculatus. 
Ceroplastes .sp rerissoptcrus mexicanus, 
Dactylopins destructor Coccophagus flavoscntellum. 
Icerya purchasi Coccophagus californicns. 
Kermes sp. on Qnercns agrifolia Coccophagns scutatns. 
Family Aleykodid i . 
Aleyrodes corni Eretmocerus corni . 
Aleyrodes on Iris Pteroptrix lla vimedia. 
Fuchsia Pteroptiix lla vimedia. 
Sonchus Pteroptrix lla vimedia. 
Willow Pteroptrix flavimedia. 
Sambncns Pteroptrix lla vimedia. 
Aqnilegia Pteroptrix flavimedia. 
Qnercns agrifolia Eretmocerus californicns. 
Willow l'.iicarsi.i angelica. 
Aleyrodes sp Bncarsia lnteola. 
ANALYSIS OF THE GENERA. 
Tarsi 1 -jointed. 
Male antennae 3-jointed; female antennae 5- jointed Eretmocerus 
Antennae of both sexes 8-jointed Pteroptrix 
Tarsi 5-jointed. 
Anterior wings with a hairless Line extending obliquely and transversely to base 
of wing. 
Three antenna] joints before the club of equal length Ifeeidia 
Three antenna] joints before, the club of unequal length. 
Ovipositor exserted to from one-fifth to one-third length of abdomen. 
Nbtal Bclerites normal, wings hyaline Cenirodora 
Mesopostscntellum acutely triangular; forewings with an irregular 
pattern of rather broad dark 1 Lnes Per%%%opteme 
Ovipositor not at all, or but slightly exserted Iphelinus 
Anterior wings without oblique transverse hairless line. 
Male antennas 4-jointed (one ring joint); female antennae 6- join ted (3 ring 
joints) PUistocharis 
Antenna? of hoth sexes 8-jointed. 
Club apparently 2-jointed Encarsia 
Club 3-jointed. 
Stigmalvein lacking; wings with very long fringe . . Aspidiotiphagus 
Stigmal vein present ; marginal cilia short. 
Marginal vein as long as or longer than submarginal- . Coccophagus 
Marginal vein much shorter than submarginal Prospalta 
Antenme 7-jointed. 
Club composed of but one joint; ovipositor extruded to half length of 
abdomen Iblerus 
Club 2-jointed; ovipositor scarcely extruded Physcus 
