396 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.51. 



the suture separating the thorax and abdomen is similarly curved. 

 Quercus-aquaticae, however, has no dorsal spines on the thorax as has 

 validus, and the pupa case is more constricted across the thorax. 



Pupa case (pi. 57, fig. 2). — Shape oval, quite distinctly con- 

 stricted across the thorax in the region of the thoracic folds. Suture 

 separating the thorax and abdomen curved cephalad and almost 

 reaching the margin of case on each side near the thoracic breathing 

 pore. Abdomen on the dorsal disk with two rows of small clear pores 

 at the lateral margins of the indications of segments. Lateral thoracic 

 and caudal breathing folds indicated by dark areas, the combs con- 

 sisting of usually four small, rounded teeth (pi. 53, fig. 17). Vasi- 

 form orifice (pi. 53, fig. 18) short and broad. Thorax with variable 

 pigmentation, but without distinct spines. Size variable, larger 

 specimens about 1.12 mm. long. 



Type.— C&t. No. 14782, U.S.N.M. 



ALEUROPLATUS (ALEUROPLATUS) SCULPTURATUS. new epecles. 



Plate 58, fig. 1; plate 59, figs. 1-4. 



This remarkable species was taken on Helicoma at Panama by Mr. 

 August Busck, April 5, 1911. It shows the most prominently devel- 

 oped rhachis in the genus, having this structure much more developed 

 than has cockerelli. The pupa case is also very large, being nearly 

 twice as long as in some other species of the genus. 



Pupa case (pi. 58, fig. 1). — Size variable, about 2.4 by 1.76 mm. 

 Shape elliptical; dorsum arched and possessing a very distinct 

 rhachis, from which very prominent sutures extend laterad, marking 

 the abdominal segments, and from which a large expanded portion 

 extends cephalad. Color dark brown to black with this median area 

 of a bright yellow, sometimes shaded with brown. Margm (pi. 59, 

 fig. 2) composed of very shallow, evenly rounded teeth. From these 

 suture-like markings extend for a very short distance mesad. Within 

 these are three or four rows all around the case of small rounded 

 papiUa-hke pores, mesad of which there are no pores until the edge 

 of the rhachis is reached. On each side of the rhachis on most of 

 the abdominal segments there is a group of three or four small circular 

 pores (pi. 59, fig. 1), and a group of six or seven similar ones is situ- 

 ated on each side of the median line on the enlarged median thoracic 

 structure. Laterad of these there is a reniform thickening of the 

 integument. Thoracic tracheal folds evident, the combs bemg com- 

 posed usually of two teeth (pi. 59, fig. 4). Vasiform orifice (pi. 59, 

 fig. 3) broad and short, the operculum filling almost the entire ori- 

 fice. Setae usually found latero-cephalad of the orifice absent. 



JlcZmZ^s . —Unknown . 



Described from pupa cases in balsam mounts. 



