84 PROC. ENT. SOC. WASH., VOL. 21, NO. 4, APR., 



about burnt sienna, with numerous closely set large, oval or somewhat ir- 

 regular lighter brown areas, representing the derm pores; boiled in KOH 

 the insect giving off a reddish brown stain, and staining the liquid a light 

 reddish brown; the derm becoming semitransparent, but remaining strong 

 reddish brown in color; the dorsal pits already mentioned appearing as two 

 deep heavily chitinized pocket-like invaginations of the dorsum on each side ; 

 the derm pores clear, conspicuous, irregular in shape and size, with the median 

 dorsal area showing small circular to oval pores, these gradually increasing 

 in size till outside of the dorsal pits, there forming a broad circle of large 

 irregularly shaped rather closely crowded pores, these again decreasing in 

 size gradually till they become even smaller than the mid-dorsal pores in 

 the submarginal area, becoming relatively minute in the marginal area, 

 the pores in the anal plate area radiating more or less distinctly from the 

 plates; antennae much reduced in size and length, maximum total length about 

 120 n, approaching the rudimentary type, obscurely 5 to 7-segmented, the 

 joints so indistinct and variable as to prevent accurate tabulations of antennal 

 measurements, measurements of a single antenna about as follows: I, 17 n, 

 II, 7.5yu, III and IV, 47 p. (with possible division making III 21.5/x and IV 

 25/x), V, HM, VI, 7yu, VII, 14 M (these lengths not including any allowances 

 for space occupied by joints), the joint between III and IV, if present, very 

 indistinct, the joints between V, and VI and VII large but incomplete; legs 

 small, semi-rudimentary, rather stout in proportion to the length, with the 

 different parts poorly formed and indistinctly separated, particularly the 

 tibia and tarsus; total length, including the elongated coxa 105/x or less; 

 coxa with about 5 hairs, trochanter very much reduced, with one or two 

 hairs, femur apparently with three hairs, tibia apparently with four hairs, 

 tarsus with about four hairs, tarsal digitules relatively long and slender, 

 produced more than half the length of the claw beyond its apex, slightly 

 knobbed at apex, claw short, broad and stout, the digitules similar to those 

 of the tarsus but not so long; marginal spines few, scattered rather evenly 

 along the body edge, small with slightly swollen bases, tapering uniformly 

 to an acute tip, maximum length about 14 /z, those at posterior end of body- 

 adjacent to anal cleft more closely set, and as much as 29 /x long; spiracular 

 spines typical of the genus, with one relatively long and large one, flanked 

 by a very much smaller one on each side, middle spine 82 n long, lateral spines 

 each about 12. SM long all tapering, bluntly rounded at apices; dorsal surface 

 apparently without spines or hairs, except for a few of the former, similar 

 to and a little smaller than the marginal spines and probably homologous 

 with them, placed along the edge of the anterior curve of the gap in which 

 the anal plates are inserted; ventral surface w r ith a number of slender hairs 

 of various sizes some minute ones close to the spiracles, the exact position 

 and relation of the others not determinable, but apparently with a pair 

 much larger than the others somewhere anterior to the anal plates; the dorsal 

 gland cell cavities or pores quite variable in size, depending on their location, 

 with the true pore or opening a minute circle usually to one side of the very 



