50 Mr. T. D. A. Coclserell on some Mexican CoccidiB. 



scattered all over, except where there are black markings. 

 These black markings consist of a band passing obliquely 

 backwards from each ocular region towards the dorsum, but 

 instead of meeting dorsally, these bands bend and form two 

 parallel faint dorsal bands. Each oblique band, near its 

 origin, sends off a posterior branch, which, running along the 

 side of the body, forms one arm of a Y, the other arm and the 

 base being the oblique band. In addition to this, a short 

 distance behind the middle, three segments are black external 

 to the dorsal bands, together forming on each side of the back 

 a conspicuous black patch. 



P (adult). Body about 5^ millim. long. General colour 

 pale greyish, the dorsal black patches almost obsolete and the 

 dorsal bands or lines becoming interrupted ; the black Y alone 

 remaining distinct. Caudal and lateral filaments or hairs 

 without white secretion, caudal ones about (or hardly) half as 

 long as body. 



The adult is thus less conspicuously marked than those 

 about two-thirds grown. The young, however, have the 

 black marks nearly or quite obsolete, the white secretion 

 tends to form interrupted dorsal and lateral keels, and the 

 caudal and lateral filaments are broadly covered with fine 

 white secretion, the caudal appearing rather longer than the 

 lateral. One can only distinguish five to eight secretion- 

 covered processes on each side, each representing more than 

 one hair. 



(J sac (puparium) white, ordinary. 



^ (adult). Body about 2|- millim. long. Caudal filaments 

 5 millim. long. Wings 3^ millim., grey, slightly ochreous 

 at base, veins darkened. Head, body, and legs grey, but 

 dorsum of abdomen white with secretion. Filaments diver- 

 ging, curving near their ends, conspicuously white. 



All the above characters can be observed wnth a hand- lens. 

 A microscopical examination revealed the following addi- 

 tional features : — 



? (adult). Legs and antenna3 brown, Antennge eight- 

 jointed, third the longest ; 4 longer than 2, 6 and 7 about 

 equal ; 5 a little shorter than 4, but a little longer than 6; 8 

 a little longer than 4 ; 1 about as long as 2. Antennal 

 formula therefore 384 (215) (67). 



Tibia longer than femur, tarsus less than half as long as 

 tibia. Claw large. 



Larva with seven-jointed antennae, 7 longest, then S. 

 Tibia about one fourth longer than tarsus. 

 ]^(/(/s oval. 

 1'his species is somewhat allied to I), virfjatm, Ckll., but 



