ALEYUODIDS OF CALIFORNIA— HEM IS. 523 



inward to the ventral surface of case, thus connecting the two disks 

 by an oblique vim on which the flutings of the wax tubes are \gy\ dis- 

 tinct; they also extend for a short distance on the dorsal disk, and 

 then fade out. Dorsum void of exudation of any kind and without 

 setie. There is also no lateral fringe, but an occasional specimen has 

 a little fragmentary wax around the ventral border of the case upon 

 the leaf. Case dull ])lack in color, and so thick that it is cleared only 

 after prolonged boiling in caustic potash, or inunersion in labarraque. 

 Abdominal segmentation distinct along the median portion of case; 

 second thoracic segment distinct near the dorsi-meson; third thoracic 

 segment distinct, extending nearh' to the marginal rim; thoraco- 

 a))dominal suture sinuate; a rounded keel reaches from the vasiform 

 oritice to the thorax, and from this point, extending nearly to the 

 cephalic margin, there is a sharp ridge; in partially cleared specimens 

 the usual dorso-medial suture shows instead of the cephalic portion of 

 the keel, Crenulations of the marginal rim irregular and notched; 

 the openings are niesad of the ends of the tubes, and form a regular 

 row of minute round pores. When a portion of the reflexed mar- 

 ginal rim is partially cleared in caustic potash and examined b}- trans- 

 mitted light, there are seen irreguhir transverse rows of groups of 

 minute black spots along the wax tubes. Vasiform oriiice tubercled, 

 subcircular; operculum relativeh' the same shape and filling the ori- 

 tice; lingula not seen; when examining the cases the operculum was 

 often seen to be raised while a drop of "hone}' dew" was being 

 emitted, after which it was again lowered into the orifice. 



Adult female. — Length, 1.8 mm.; forewing, 1.3 by 0.53 mm.; hind 

 wing, 1.08 by 0.4 mm.; color uniformly a deep golden yellow, legs 

 and antennje paler; mentum yellow, the tip dusk}'. Wings somewhat 

 dusky at distal end; this is caused by a structural thickening; the 

 costal margins are a conspicuous golden yellow; main veins distinct 

 to apex; flexure of forewing not acute; basal vein long — it arises from 

 tlie very base of the wing, apparently distinct from the main vein, 

 and extends obliquel}^ caudad to anal margin. Eyes dark red, con- 

 stricted to dum1)-bell shape. Antennti? usual. (Genitalia acute conical, 

 ordinary. 



2r<iJ,>. — Length, 0.83 mm.; forewing, 1 nun. by 0.4 nun. (Genitalia 

 ordinary. Very much smaller than the female; in other respects 

 essentially the same. 



Cotyp<s.—)so. 709,8, U.S.M.M. 



Collected on Clematis ligusticifolia.^ Ehamnus califtmiica, Arhutus 

 me)isiesi/\ Arctodaphylox manzanita., Z^vihtUnlaria califoi'nlca^ lletcv- 

 omeles arhutlfolla., Eriod'ictyon calif onricum^ Ceaiwthus californlcus, 

 Symjihoricarjyos racemo.n/s, Prumis ilicifolla^ and Zotiicem involucrata 

 in tlio San Ramon Valley at the base of iMount Diablo, in the Santa Clara 

 Vallev,on Black and on King's mountains, and on the slopes of the Santa 



