Marriner. — On a New Species of Psyllidae. 307 



The head is broader than long, concave in front and depressed 

 behind. The lower and front portion is prolonged into two 

 conicai projections, with numerous hairs. The rostrum is 

 situated on the ventral surface of the thorax, and has a 

 black pointed tip. The female has no setae on the rostrum. 

 Wings are large and membranous, and arch over and extend 

 beyond the abdomen. Antennae of ten joints (Plate XXXIII., 

 fig. 8), the third joint being no thicker than the fourth. The 

 first two joints are short, round, and scaly; third joint is 

 longest ; last joint is dilated and of a dark colour, with two 

 unequal spines on its extremity. Legs are slender; tibia has 

 numerous small spines on distal end, but in the third pair of 

 legs these are partly replaced by four black conical projec- 

 tions. Tarsus is double-jointed, the second joint having two 

 hooks or spines and a sucker on its distal end. Abdomen has 

 a conspicuous yellow mass (Plate XXXIII. , figs. 6, 7). probably 

 corresponding to the pseudovitellus' :: of the pupa. The anus 

 is situated on the dorsal surface some distance in front of the 

 genital organs. The genitalia are larger in comparison with 

 the abdomen than in Psylla pyricola, and are of a dark-brown 

 colour, especially at the tips. Genitalia consist of tnree plates 

 (Plate XXXIII., fig. 6) — the upper genital plate (A), the lower 

 genital plate (D), and, close to the upper genital plate, a third 

 plate (Plate XXXIII. , fig. 6, B) called by Witlaczil the " main 

 rod." Between this and the lower genital plate is a very 

 transparent roundish lobe called the egg-sheath (C).f Viewed 

 sideways the upper genital plate is longer than the lower ; 

 all except the egg-sheath are sharply pointed, with numerous 

 hairs scattered about. 



Adult Male. — This is very similar to the female, but the 

 rostrum has three setae, which are entirely absent in the fe- 

 male. The anus (Plate XXXIII. , fig. 7, H) is situated on top of 

 the upper genital plate instead of on the abdomen itself, as in the 

 female. Genitalia (Plate XXXIII. , fig. 7) : The lower genital 

 plate (B) is large and round, and forms the end of the body. 

 It is prolonged upwards to form a pair of claspers (C). The 

 upper genital plate is about as broad as it is long, and, like 

 the remainder of genital organs, stands up almost at right 

 angles from- the body. Penis (E) is long and doubled back 

 on itself at D, and provided with a hook at the end. Punning 

 through the penis is a duct (K). Having mounted two speci- 

 mens during copulation, I find the arrangements of the organs 

 are as follows : The claspers of the male grasp the lower plate 

 of the female ; the upper plate of the male clasps the upper 



* Witlaczil. 



| I am a little doubtful about the homologies of the two portions 

 last mentioned. 



