Plate IX 



Rhinoscepsis bistriatus LeConte 



Fig. 1. Ventral view of head of female. Note the character of the mandible - 

 crenulate labrum; labium with labial palpus, mentum and sub- 

 mentum, maxillary palpus with cardo, stipes, lacinia and first seg- 

 ment of palpus; rudimentary, large-faceted eye, partially set in the 

 rudder-shaped ventral portion of the cephalic groove; right gular 

 fovea at point where gulo-genal suture disappears anteriorly, the 

 fovea representing externally the attachment of the right arm of 

 the supratentoriura where it joins the ventral surface of the head, 

 and this indicated by a pair of dotted lines; the broad "gular field."" 



Fig. 2. Dorsal surface of head of female. Note anteriorly the approximate first 

 or basal antennal segments, with their dorsal articulation to the 

 front indicated by dotted circles ; the rough character of the integu- 

 ment; median longitudinal oval sulcus and strong longitudinal 

 median carina; the right vertexal fovea, with its attachment to the 

 right arm of the supratentorium indicated by dotted lines; the 

 rudimentary, large-faceted eye, partially set in the sigmoid dorsal 

 portion of the cephalic groove which ends posteriorly on each oc- 

 ciput; the medianly notched and posteriorly striulated character 

 of the base of the head. 



Fig. 3. Seta found on the ventral surface of the head. 



Fig. 4. Last four segments of right antenna of female. 



Fig. 5. Distal (fourth) segment of right maxillary palpus showing the palpal 

 cone on the apex. 



Fig. 6. Right lateral aspect of female, after treatment in cold 5% KOH for 

 two hours to soften the integument. Reading from right to left is 

 noted the typical pselaphid antenna of eleven segments with a 

 three-segmented club and the characteristic dorsal articulation of 

 the antenna to the head; beneath the excavated fronto-clypeal area 

 is seen the horizontally directed labrum and below the labrum the 

 long, arcuate mandible; the complex cephalic groove of the right 

 side is shown passing obliquely ventral to the right vertexal fovea 

 and turning abruptly ventral anteriad of the rudimentary eye, 

 which lies partly in the groove, and then passing anteriorly for a 

 short distance and expanding posteriorly, ending near the back of 

 the head; the compact prothorax with its large prothoracic coxa; 

 the rudimentary metathoracic wings; the elytron represented by a 

 straight line above the wing; the meso- and metathoracic coxae; 

 the abdomen with eight tergites discernible, of which the first two 

 are membranous and the last six are visible and sclerotized; six 

 pleurites and spiracles are present and nine sternites are indicated. 



Fig. 7. Ventral aspect of prothorax of female showing the large basisternum 

 and confluent prothoracic coxal cavities (FCC). Note the well- 

 developed lateral prosternal foveae (LPF). 



Fig. 8. Detail of the left Lateral Prosternal Fovea. Note the characteristic 

 whorling of the course of the fovea, when seen in slide mounts at 

 high magnification. 



Fif. 9. Dorsal surface of mesothorax of female under high magnification, a. 

 mesoscutum; b. and c. elytral articulations on the scutellum and 

 side pieces; d. axillary cord of right elytron; e. small posterior por- 

 tion of mesoscutellum ("scutellum") which is visible between closed 

 elytra; f. mesoscutellum, showing the characteristic striulation; 

 g. mesoprescutum. 



