EXPERIMENT STATION BULLETINS. 675 



but red or yellowish-brown is a usual color, sometimes marked with 

 darker hues. Often a greenish tint is apparent. It appears to have 

 posed under a great variety of names, and is sometimes called the "soft 

 Brown Scale." 



The adult female is naked. The boiled and stained derm is marked 

 by a few round gland-pores in the vicinity of the anal-plates and by 

 others in rows extending from the spiracular setae to their correspond- 

 ing spiracles. The derm is marked also by scattering small, round pores 

 all over the body. Antennae usually seven-jointed, long, and slender. 

 The anal-plates are rather narrow, the caudo-lateral margin being 

 longer than the cephalo-lateral ; the lateral angles are rounded and the 

 caudal angles more sharply rounded. There is a small V-shaped angle 

 at the point where the plates touch at their cephalic ends. There are 

 usually two fringe setae on each plate, two and rarely three sub-apical 

 setae and four small, apical setae. The anal-ring is usually situated 

 far in front of the plates and the setae of the anal-ring are proportion- 

 ally long and slender. 



Spiracular setae with middle one long, slender and often curved and 

 with the outer ones sharp, pointed and tack-like. Marginal setae 

 slender, pointed, each borne on a button-like base, a small proportion 

 of these setae are forked at the tip and likewise a few show a suggestion 

 of a fringe. Anal-ring having eight long hairs. 



There is a form which differs in no wise from the typical hesperidum 

 in the characters of derm and plates but which is marked by a large 

 mottled cross, sometimes by a double cross on the dorsum. It answers 

 perfectly to the description of L. aliemim of Douglas, so far as external 

 appearance is concerned. It seems to be a race or a variety since num- 

 bers of these cross-marked specimens are commonly found in company, 

 often on palms or on house rose. L. hesperidum lives on a great variety 

 of greenhouse plants. 



LECANIUM (Coccus) LONGULUM DoUg. 



Adult female elongate-oval, either elevated or flattened, depending 

 on emplacement; yellowish-brown to dark-brown, sometimes reaching 

 a length of 1/4 inch; surface smooth, marked by punctulations ; anten- 

 nae eight-jointed, slender. Spiracular setae with middle one curved 

 and slender, tapering. The two outer setae being shorter and tack-like. 



Derm marked by a copious sprinkling of small, round pores, feebly 

 chitinized. Anal-plates with caudal and cephalic angles sharply round- 

 ed. Lateral angle more broadly rounded. There are four fringe setae 

 and four sub-apical setae on each side. Three small apical setae and 

 one discal seta on each plate, these last being on the dorsal surface. 



Found only under glass in Michigan. The species used to abound 

 in the green-houses of the Michigan Agricultural College, but for sev- 

 eral years it has been difficult to collect since it is kept in subjection 

 by a fungus disease, Isaria lecanifera. 



