W. WESCHE. 



EXPLANATION OF PLATE. 



FIG. i. Di gram of left antenna of Scatopse minutissima, to show the partial 

 ankylosis between fourth and fifth joints. 



FIG. 2. Diagram of the right antenna of same insect, showing normal structure. 



FIG. 3. Diagram of antenna of Dilophux febrilis, showing condition of distal 

 joint. 



FIG. 4. Diagram of antenna of Dilophus albipennis to show condition of distal 

 joint. 



FIG. 5. Gland (?) from the maxilla of Scutigera, highly magnified. Its situation 

 is shown in Fig._ 120. 



FIG. 6. Second tarsal joint of hindleg of Gynoplislla bella (Tipulidae) to show 

 pubescence under magnification of 60 diameters. 



FIG. 7. Second tarsal joint of Leptis scolopacea under like magnification. 



FIG. 8. Tibial bristle of hindleg of Panorpa communis. 60 diameters. 



FIG. 9. Tibial bristle of hindleg of L. scolopacea. 



FIG. 10. Tibial bristle of hindleg of G. bella. 



FIG. ii. Second tarsal joint of hindleg of Panorpa communis, as seen with 

 magnification of 60 diameters. 



FIG. 12. Diagram of a segment from the mouth of Scutigera to show the maxillae 

 and situation of the poison (b) and other glands (a). 



FIG. 13. Second joint of maxillary palpus of Rhyphus punctatus. Diagram 

 in optical section to show gland (a) with duct opening in the anterior portion of 

 the joint, and the sense organ which is probably olfactory (b), as seen with mag- 

 nification of 300 diameters. 



FIG. 14. Trophi of Rhyphus feneslralis showing the ventral side. The right 

 palpus shows the sensory structure on its surface, while the left is drawn in optical 

 section to show shape, situation and structure of the gland contained in interior, 

 The mentum shows a distinct median structure, and below it are the submentum. 

 and a portion of the pharyngeal pump, m; mentum; sm, submentum; pp, pharyn- 

 geal pump; a, gland; /, lacinia of maxilla. Drawn from several specimens mounted 

 with and without pressure, showing structure under magnification of 300 diameters. 



FIG. 15. Hypopharynx of R. fenestralis showing submentum, an unusual 

 condition. 



FIG. 16. Labrum of R. feneslralis. 



FIG. 17. Second joint of palpus of R. brevis Walker, differing from R. punctatus 

 in the size and attachment of the gland (a) and the character of the sense organ (b) 

 and from R. fenestralis in the attachment of the gland to the wall of the segment, 

 and in the character of the sense organ. Same magnification as Fig. 13. 



FIG. 1 8. Tibial bristle of hindleg of R. fenestralis. Magnification of 300 

 diameters. 



FIG. 19. Tibial bristle of hindleg of R. punctatus. Same magnification. 



FIG. 20. Gland from interior of second joint of palpus of Simulium reptans, 

 to show structure on side opposite the opening. 



FIG. 21. Second joint of palpus of 5. reptans, highly magnified. 



FIG. 22. Point of maxilla of Scutigera, seen in optical section and highly 

 magnified, showing openings of the poison duct (a) and of other gland (b). 



N.B. The size of the figures has no relative significance. 



