8 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65. 



with the angle from which it is observed. Perpendicular to the 

 horizontal plane it is purplish-bronze with a green reflection, while 

 from an acute angle more green color is apparent. 



The fleurwm {pl^ fig. 38) of the prothorax consists mainly of 

 hypopleurum with its two irregular, chitinized areas, the pre- and 

 post-hypopleurites, and epipleurum, which is greatly reduced and 

 entirely membranous. The coxal process of the kypopleurum (cxp, 

 fig. 38) is the dark, chitinized projection to Avhich the coxa articu- 

 lates. The pleural suture {pis, fig. 38) extends dorso-cephalad from 

 this process as a dark, curved line. The pre-hypopleurite {prh, fig. 

 38) is the dark, irregular, chitinized area cephalad of this suture. 

 Its cephalic part is inflexed dorso-cephalad. The post-hypopleurite 

 {poh, fig. 38) consists of the irregular, chitinized sclerite extending 

 laterad and caudad of the pleural suture. The caudal part of the 

 post-hypopleurite bears five or six minute setae. The entopleurutn 

 (enp, fig. 38) extends from the end of the pleural suture meso- 

 caudad as a platelike projection and becomes broader at its distal 

 end. The epipleurum is the membranous region caudad and slightly 

 dorsad of the post-hyi3opleurite. 



The sternum of the prothorax is the area on the ventral aspect 

 caudad of the cervical region, mesad of the legs, and extending 

 caudad to the invagination for the spina. The presternu7n (fig. 38) 

 is either absent or included in the folded membrane of the cervical 

 region. The eusternum {eust, fig. 38) is the area between the inser- 

 tion of the coxae and extending caudad to the furcal pits. It is 

 entirely membranous except for a slightly chitinized region between 

 the insertion of the legs, which bears four distinct setae and a number 

 of smaller ones. Caudo-mesad of the legs are small pits which mark 

 the invagination for the furcce {fu. fig. 38). Between and behind 

 these is sternellum (r=f urea-sternum Crampton). The post-st&rnel- 

 luTJi {postl, fig. 38) (r=spina-sternum Crampton) is the transverse 

 region caudad of the sternellum. It is entirely membranous. Lat- 

 erally are the small, slightly chitinized invaginations of the fur- 

 cellce {fuca, fig. 38) and on the median part is the more prominent, 

 chitinized spina (Crampton) (s, fig. 38). 



Mesa- and M eta-thorax. — The mesothorax and metathorax are simi- 

 lar enough to be described together. They are narrower than the 

 prothorax and are constricted at their cephalic end. The terga {te^ 

 fig. 37) are the somewhat cordiform, slightly convex, chitinized 

 sclerites. The cephalic part of each sclerite is narrower and is 

 produced into three or four pointed projections, which articulate 

 with the sclerite in front of it. A suture extends along the meson 

 dividing the terga into equal parts. The setae are brown, are more 

 numerous on the lateral and caudal margins, and varv in size from 



