ACARI OP THE GENUS GLTCIPHAGrS. 281 



insertion of the third leg, consists of two large, slightly cHti- 

 nized labia somewhat separated posteriorly ; it is entirely sur- 

 rounded by a chitinous band or sclerite (Eobin's sternite) at some 

 distance from the labia laterally, but almost touching them at 

 their lower most separated part. The chitinous ring is thickest 

 at the sides and thinnest posteriorly. Chitinous epimera, or 

 bands, start from above the first leg, below the second leg, and 

 between these two legs, and all run radially inward, joining the 

 vulval sclerite above described. The epimeron in front of the 

 third leg is a s^hort curved piece, often almost obsolete, running 

 forward, and nearly, but not quite, touching the epimeron from 

 below the second leg about its middle. The epimeron behind 

 the third leg is a somewhat similar, but more strongly marked, 

 piece pointing toward the lower part of the vulval sclerite, but 

 not nearly reaching it. There is scarcely any epimeron to the 

 fourth leg. 



Legs very similar in all respects to those of G. platyg aster, but 

 rather thicker in proportion. The hairs are practically similarly 

 placed. 



Abdomen resembling that of the female of G. platygaster in 

 general form, but not quite so wide in proportion to its length, and 

 the liind margin is totallg different, for, instead of being straight, 

 it is entirely occupied by two great rounded lobes directed back- 

 ward; the projecting "anal button" (bursa copulatrix) is sunk 

 in the indentation betweeu. the two lobes. There are nine pro- 

 jections on each side, instead of ten as in G. platygaster. These 

 are usually all more or less bifid or trifid ; they are irregular in 

 form, each one, except the second and sixth, serving as the point 

 of insertion of a very strong pointed spine, thick at the base and 

 gradually narrowing. The first of these spines points forward, 

 the others, instead of being nearly radial as in the last species, 

 are strongly curved, often having a tendency to a double curve, 

 and are directed first outward and then backward, so that the 

 distal portion is nearly parallel to the side of the abdomen. There 

 are not any spines on the notogaster except two so close together 

 that they generally look like a single large one in the median line 

 a little behind the centre, and a pair of much smaller spines 

 further forward. The anal opening is large, placed rather far 

 forward, and entirely surrounded by an elliptical chitinous ring, 

 within which the whole anal region is white. There are two 

 pairs of spines of moderate size near the hinder part of this ring, 



