428 Mr. T. D. A. Cockerell on 



The insects placed in caustic potash without boiling give a 

 lilac colour ; boiled, they give a dark purple. 



? (containing embryos) similar to P. tinctorius, but 

 smaller. Anal ring with 6 bristles. Caudal and dermal 

 structure and form of body as in tinctorius; antennas 6-seg- 

 mented, formula 6 3 2 5 (14), but there is a very marked 

 false joint, dividing 3 just beyond its middle, and another 

 at the end of the basal third of 6, so that the antennae seem to 

 be 8-segmented. Legs tinged with brown, resembling those 

 of tinctorius ; trochanter with a long hair. Embryonic larva 

 more than twice as long as broad, with very minute spines or 

 bristles arranged in rows after the manner of Eriococcus. 



Hab. Cuautla, Mexico, May 31, 1897, on mistletoe on 

 lime [Koehele, 1738). Div. Ent. 7919. 



Named after Mr. T. Pergande, of the Department of Agri- 

 culture, who looked at the specimens before they were trans- 

 mitted to me, and recognized them as belonging to a new 

 genus. 



Peotodiaspis, gen. no v. 



A genus of Diaspinse secreting no distinct scale, but the 

 females enveloped in cottony secretion, the male pupae resem- 

 bling those of Diaspis, but extremely short. No grouped 

 circumgenital glands. 



Type P. parvulus. 



Fiorinia syncarpice^ Maskell, possibly belongs to the same 

 genus. 



Protodiaspis parvulus, sp. n. 



? . — Very small, little over ^ millim. long, enclosed in 

 irregular white cottony secretion ; exuviae light yellow. 



? . — Bright yellow, colourless after boiling in KHO; broad 

 oval or nearly circular; skin with numerous small round 

 glands; mouth-parts large, rostral loop short ; on each side of 

 the mouth-parts is, on a rounded patch, what I take to be a 

 stigmatic orifice, and also a group of about eleven round glands 

 resembling the circumgenital glands of Diaspis; anterior to 

 the mouth-parts are two nearly circular structures which may 

 be rudimentary antennae ; abdomen with six very distinct 

 segments, exclusive of the terminal piece, which is not very 

 large ; anus very distinct, a fair distance from the hind end, 

 the skin round it strongly concentrically striate ; hind margin 

 broad and flattened, not at all produced, with four very low, 

 broad, rounded, colourless lobes, well apart, their edges in- 

 clined to be crenulate ; very small spines, but no spine-like 

 plates. 



