June, '11] PEMBERTOX: CHRISTMAS-BERHV TINGIS 341 



Each body segment bears on its lateral margin, a long spine, with a heavy conical 

 base, secreting at its tip a transparent viscous fluid. About twenty more of these 

 spines occur on the dorsal surface of the body, distributed as follows: two at the 

 anterior tip, two pairs on the posterior portion of the head and ten or twelve scattered 

 over the dorsal surface of the last five abdominal segments. The facets of the com- 

 pound eye were always four in number in this stage. 



Nymph, Stage II. Length .8 mm., width .53 mm. This stage is much broader in 

 proportion to its length than in the first stage. The legs are slightly less club-like and 

 stocky. The large spines on the dorsal marginal portions of the body have become 

 considerably changed. Their bases have become greatly elongated, are tubular in 

 form and compose over one half the length of the spine. The facets of the com- 

 pound eye in this stage are five in number. 



Nymph, Stage III. Length .96 mm., width .54 mm. The length of the third 

 antennal segment is a little greater in proportion to the combined lengths of the first 

 and second segments than in the preceding stage. The bodj' is slightly longer in 

 proportion to the breadth than in the preceding stage. A small secondary spine 

 has appeared near the base of nearly all the large dorsal and marginal spines. The 

 first and second body segments behind the head are slightly broader and are longer 

 laterally than in the preceding stage. The facets of the compound eye are generally 

 seven in number in this stage. 



Nymph, Stage IV. Length 1.5 mm., width .7 mm. The general form is similar 

 to that of the third stage. The antennae are four segmented, the third segment 

 being a little longer than the fourth which is about the length of segments one and 

 two combined. The antennae are still about the same length compared with the 

 length of the body, as in stages one, two and three. The prothorax and mesothorax 

 are much broader laterally, each being about three times as broad as long. The 

 spines at the lateral margins of these two segments in this stage are about twice as 

 numerous as in the other .segments. The prothorax tapers posteriorly a little. 

 The actual wing pads are first seen in this stage and are modifications of the second 

 body segment posterior to the head. They extend posteriorly to the middle of the 

 second abdominal segment, the posterior extensions being confined to the lateral 

 portions of this segment. The spines are unchanged. The facets of the compound 

 eye are greatly increased in number. 



Nymph, Stage V. Length 2 mm., breadth 1.2 mm. The first two segments of the 

 antennae are equal in length. The fourth segment is equal to the combined lengths 

 of segments one and two. The third segment is a little more than twice the length 

 of the fourth segment. The legs are thinner and longer in proportion to the size of 

 the body than in the preceding stages. The prothorax is half as long as broad, with 

 the median anterior portion elevated. The wing pads extend to the anterior margin 

 of the fifth abdominal segment. 



Adult. The adults, male and female, can be easily distinguished 

 without the aid of a lens. The tapering, bluntly-pointed abdomen of 

 the male distinguishes it readily from the regularly rounded abdo- 

 men of the female. Another very distinctive feature of the male 

 abdomen is the presence of a pair of large forcep-like claspers situated 

 at the posterior tip. 



The ovipositor of the female is concealed in a short, longitudinal 

 groove on the under .side of the abdomen at the posterior tip. The 

 sides of the eighth abdominal segment overlap it, almost concealing 



