1915.] 179 



with numerous minute circular pores, and scattered, short, fine hairs. There 

 are some longer hairs on the venter, more particularly on the post-frontal area 

 an<i in transverse series aci'oss the abdominal segments. A single longish hair 

 projects from the lateral margin of each of the last three abdominal segments. 

 Marginal groxiped spines small and feebly developed, especially on the ab 

 dominal segments where they are obsolescent, but rather more conspicuous on 

 the anterior margin. Length, 3.25 to 4.25 mm. Breadth, 1.50 to 1.75 mm. 



Discovered by Mr. H. Donisthorpe, in nests of Formica picea, 

 amongst sphagnum moss in swampy ground, Matley Bog, New 

 Forest, Hants ; July. 



The character of the dermal pores suggests that the insect, in life, 

 is very thinly coated with mealy powder. The very feeble development 

 of grouped marginal spines points to a corresponding absence of waxy 

 appendages. 



Near Ps. hihernicus (Newst.), from .which it differs in the absence 

 of the intersegmental squamose structures described by the author of 

 that species, and in the presence of a strong group of hairs on the 

 under surface of the post-frontal area ; also in the proportionately 

 greater length of the first three antennal joints. In hihernicus, the 

 first and second joint together are said to approximately equal the 

 eighth ; while, in sphagni, joints 1 and 2 approximately equal joints 

 7 and 8 together. 



PSETJDOCOCCUS GAHANI nOV. 



Adult female thickly coated with greyish-white mealy secretion, which is 

 thinner in the folds of the segments and in the depressed areas. These 

 depressions are in four more or less confluent longitudinal series which are 

 more marked on the posterior half of the body. The darker colour of the 

 insect showing through the mealy covering at these spots, produces a distinct 

 symmetrical pattern (see fig. 4). There is a complete marginal series of 83 short 

 conical waxy processes, an anterior and posterior pair being usually larger than 

 the others. On each side of the anal orifice is a much longer, broadly laminate 

 process which is transversely curved and spirally twisted, and between these is 

 a pair of shorter processes, which together form a tube. Antenna, 8-jointed, the 

 8th longest ; first joint strongly developed, approximately as long as it is broad ; 

 antennal formula (excluding 1st), 8 (3, 2), (5, 4, 6, 7), the last four being only 

 approximately equal and varying slightly in their relative positions in the 

 series. Limbs well developed ; tarsus approximately half the length of the 

 tibiae. Eyes prominent. Mentvim distinctly biarticulate ; longer than broad ; 

 terminal joint longest, acutely pointed. Dorsal glandular pits present but 

 rather inconspicuous. Anal ring large and conspicuous, with six long stout 

 setae. Anal lobes broadly rounded ; only slightly prominent ; more strongly 

 chitinized than the surrounding parts, the margins of the chitinous area sharply 



02 



