Observations on some species of Orina. 13 



narrower (half the width of the second) thimble-shaped piece, 

 also retractible, and ending in a few very minute bristles. 



The labrum consists of a basal part very wide from side 

 to side, very narrow antero-posteriorly, of somewhat uni- 

 form size from side to side, and a second joint narrower than 

 the first, nearly square in general outline, of darker chitin, 

 with a strong rounded projecting flap on each side with 

 notch between them. These two pieces are retractile so 

 as to much vary their joint length. 



The jaws are large and strong, with five sharp teeth, the 

 anterior shortest and with a minor point near its apex ; 

 each tooth has a finely serrated edge. 



The maxilla has a basal piece and a narrow terminal 

 piece; this latter carries an inner process of one joint and 

 an outer palpus of three joints, each furnished with several 

 bristles. The labium, on a large transverse chitinous 

 segment, carries the two palpi, each of two joints. 



The legs present no structural differences to those of 

 the other species. They consist of three segments of about 

 equal length, together with a base which is rather part of 

 the body of the thorax, than truly belonging to the leg, 

 and a terminal claw. 



The first or basal joint is very thick and tapering to its 

 extremity, its form and size make it the coxa, but I am 

 not learned enough in the comparative anatomy of these 

 parts to say it is not the trochanter. The second joint is 

 clearly the femur and the third the tibia, this follows 

 from the aspects of their articulations. The coxo-femoral 

 articulation is simple in being distinctly only one joint, but 

 has somewhat complicated arrangements, so that possibly 

 the trochanter is represented here. The claw represents 

 the tarsus and has a large thickened base, showing it to 

 be more than a claw, the base carries several hairs. Some 

 specimens even suggest that there is an articulation 

 between the claw and this base, but I incline to think 

 this is not so, though it suffices to show that the base 

 is really the tarsus. 



Orina cacalise, young larvae found feeding September 

 7th, and one had changed its skin ; none were there on 

 3rd; no trace of egg-shells. Young larva absolutely 

 black, the claws brownish, with a row of short bristles 

 across each subsegment. Newly moulted larva, yellowish, 

 quite transparent. The general resemblance to 0. vitti- 



