ABT. 2 BEETLE LARVAE OF GALERUCINAE BOVING 17 



Prothoi'ax (fig. 18). — Prothoracic shield with a somewhat cordi- 

 form depression anteriorly in the sagittal line and six to eight foveas 

 on each side between the sagittal middle line and the margin of the 

 shield; anterior and posterior margin with a few minute setae. 

 Epipleural area with a large sclerite. Prehypopleural and posthy- 

 popleural sclerites (== episternum and epimeron) oval, about similar 

 in size and color. Eusternal and sternellar sclerites fused into a 

 single, rectangular, median plate ; with two minute setae on each side. 



Mesothorax and nietathorax (fig. 18). — Interior and exterior 

 sclerites of prescutum fused to a single compound plate with a sagit- 

 tal white line and a curved, white, incomplete line indicating the limit 

 between the exterior and interior sclerites. Interior and exterior 

 sclerites of scuto-scutellum developed as in prescutum. Alar area 

 carrying a large sclerite, as long as the entire segment and anteriorly 

 separated only by a fine suture from a sclerite covering the entire 

 spiracular area; both areas with a few minute setulae. Epipleural 

 area with a large subtriangular sclerite w^th a few setulae. Prehypo- 

 pleural and posthypopleural sclerites as in prothorax. Eusternal 

 sclerite median, single, approximately crescent shaped, three times as 

 broad as long, densely asperate, and with two setae on each side. 

 Sternellar sclerite paired, developed as a minute asperate disk around 

 the foot of a small seta. 



First to eighth abdominal segments (fig. 18). — Compound inte- 

 rior sclerite of prescutum separated from exterior sclerite by a thin 

 white suture. Compound interior sclerite of scuto-scutellum fused 

 with exterior sclerite on each side into one single scuto-scutellar 

 plate. Anterior and posterior sclerites of the parascutal area about 

 equal in size, and separated by an oblique furrow; spiracle situated 

 in the anterior sclerite. Epipleural sclerite about as long as the 

 segment and subquadrate. Hypopleural sclerite distinct, ovate, with 

 two small setae. Compound eusternal sclerite asperate and of the 

 same form and size as in mesothorax and metathorax. Sternellar 

 area with one small, round, and darkly colored asperate sclerite on 

 each side, and in some of the segments with a dark speck close to the 

 middle line ; one or two small setae on the sclerite, one on the minute 

 speck.^- 



Ninth abdominal segment. — Pygidial shield subrectangular with 

 rounded corners, leathery, variolose, and with about half a dozen 



" The sternellar sclerites may be reduced in size in some of the abdominal segments 

 •while they are distinct In the other segments of the same larva, but specimens in which 

 sternellar sclerites are completely absent are not found in the material of larvae of 

 G. ni/mphaeae preserved in the National Museum. K. L. Henriksen, however (see bibli- 

 ography), finds that these sclerites are regularly absent in the European specimens of 

 the same species. 



22483—29 3 



