ALEYRODIDS OF CALIFORNIA— BEMIS. 511 



g-lassy rods, ))ut ovorv effort to dottich it was unsuccessful; from this 

 it was assumed that if it were a true lateral friiig-e, it had adhered to 

 the underlying ring, or, if it were a constituent part of the mass, then 

 the gelatinous rim was a lateral and not a ventral secretion. 



The dorsal secretion is of white, tiocculent wax, in tufts or pencils 

 attached to and enwrapping stout spines. Upon the cephalic region, 

 near the mouth parts, there are found two small tufts or knobs; on the 

 meso-thorax are two similar tufts. ))oth sets near the dorso-median line; 

 at the vasiform orifice arc two pairs of short pencils; between the 

 more caudal pair is a long pencil, whicli is prolonged for some distance 

 caudad of the base and rests upon the gelatinous wax. This pencil has 

 no underhing spine nor an^' visible pore from whicli it might issue; 

 there are a number of pointed folds lying close together around the 

 place of issuance, but these are prol)ably a part of the ventral furrow. 

 There is considerable variation from the usual arrangement given 

 above, any or all of the pairs of tufts may be more or less pencil-like, 

 this seeming to depend upon the length of the spine to which any tuft 

 is attached; at the vasiform orifice the two pairs of pencils are some- 

 times curved and rim-like in their arrangement. 



The dorsum is covered with large polygonal markings and has a large 

 number of small pores more or less regularly arranged; of the latter 

 there is a row of closely set ones near the margin of case, three sub- 

 parallel rows each side of dorsi-mesou on the abdomen, and a number 

 placed irregularly on the thorax and cephalic region. The abdomen 

 has a well-rounded keel along which the sutures are distinct; the 

 dorsi-medial and thoraco-abdominal sutures are conspicuous, the latter 

 very sinuate and extending to the lateral margins. Margin all around 

 crenulated with a double rim, the ends of the tu))es of the dorsal rim 

 sharply dcflcxed downward, and the crenulations irregular; in places 

 they are rounded, with the incisions between the tubes about the width 

 of the crenulations; in other places they are crowded and almost form 

 serrations. From these incisions thickenings extend mesad some dis- 

 tance, producing an irregularly-marked margin. Vasiform orifice 

 subciivular, l)Ounded on the cephalic and lateral margins by a straight 

 perpendicular rim, which becomes veiy sloping at caudal margin; here 

 its inn(>r margin is chitinized or thickened for some distance wnthin the 

 cavity and at the bottom of the orifice it is thickly covered with ti-anspar- 

 ent dots; operculum short, seldom more than one-half as longas oriri(H>. 

 broadly ovate, with cephalic margin not coincident with margin of 

 orifice; lingida reduced, onh* the incised })asal portion iiresent. Legs 

 rather long and stout, nonsegmented, but with folds indicating future 

 joints. Antenna not evident. Eye-spots Aery large; ))y transmitted 

 light, l)rown, with reddish margin. 



Adalt )ii(iJ<\ — Length of body, o.'.tT mm.: iiiiid tarsus, o. l.'i mm.; 

 hind tibia, 0.25 mm. ; proximal tarsus, o. IT) nun.: hind til)ia. (». 1 7 mm.; 



