430 Mr. T. D. A. Cockevell on 



sac white, distinctly tinged with yellow on its basal half; 

 distinctly ribbed, but the ribs weak and flattened. 



? . — Boiled in KHO gives a crimson colour. Antennse 

 and legs dark brown ; antennse 9-segmented, 9 longest and 

 about as long as 6, 7, and 8 together ; 2 and 3 subequal ; 

 4 to H subequal and shortest. Segments with whorls of 

 bristles, two of those on 8 very long, extending beyond tip 

 of 9 ; two hairs on 9 are much longer than itself. Coxa with 

 a whorl of apical bristles; trochanter with about six short 

 bristles and one long one ; femur moderately bristly, several 

 erect bristles on its inner side ; tibia slender, rather longer 

 than femur, with three or four long bristles on its outer side 

 and about ten pairs of short stout ones on the inner j tarsus 

 about half as long as tibia, curved ; claw stout. Skin 

 sparsely beset with hairs and presenting numerous small 

 round glands. 



Larva with six very long caudal bristles, and six long 

 curved bristles on each side anterior to them. 



Hah. El Faro, near Frontera, Mexico^ on Croton on the 

 sea-beach, on the sandy ridges just beyond the reach of 

 ordinary surf ; May 16, 1897 {Townsend) . Div. Ent. 7636. 



leery a littoralis, var. mimosce, var. no v. 



Characters of /. littoraUs in general. Boiled in KHO 

 gives a deep raspberry colour. Antennse 9-segmented, but 

 9 only a little longer than 7 + 8. Ovisac about 8 millim. long, 

 like that of h'ttorah'Sj but all the secretion of both female 

 and ovisac a delicate primrose-yellow. 



Ilab. Las Minas, near Frontera, Mexico, June 4, 1897, 

 on " Sarsa," Mimosa, sp. [Townsend). Div. Ent. 7816. 



Ortonia mexicanoi-um, sp. n. 



? . — Under cover-glass about 6 millim. long. The dried 

 insects are oval, dark grey, more or less mealy, often densely 

 so, with two curled white cottony caudal filaments, nearly 

 4 millim. long. Boiled, the insects turn the liquid sherry- 

 colour and themselves become dark mulberry-red, stained 

 with blackish on the abdominal dorsum, but without black 

 spots. 



Antennae and legs dark sepia-brown ; antennge about as 

 long as femur + trochanter, 10-scgmented, 10 about as long 

 as, or a little longer than, 8-|-9, all the segments except 10 

 broader than long, each with a conspicuous whorl of strong 

 bristles. Formula approximately 10 (3 2 1) 6 (7 9 8) (4 5) ; 

 4 and 5 are conspicuously shorter than 3 or 6 ; 2 is sometimes 



