36 PEOCEEDIXG3 OF THE NATIONAL MUSEUM vol. 79, 



of the aedeagus is more like that of Monocesta. Clark described only 

 one species, vuiculicollis, and his description, except for the larger 

 size, applies perfectly to siibcyanescens. In the United States 

 National Museum collection are several specimens of Coraia, one of 

 which is undoubtedly Tnaculicollis. The others are all smaller, and 

 the Texas ones smallest of all, but all of them are very similar in 

 shape, coloring, and sculpture. It may be that subcyanescens is 

 merely a dwarfed northern form of macuUcoUis, but the question 

 can not be settled until a larger series of specimens can be com- 

 pared. C. siibcyanescens has been collected only at the very southern 

 tip of Texas. Two other Mexican species, quite distinct from 

 this or maculicollis, have been described by Jacoby — ajncomis, 

 with a 7-spotted pronotum, and clarki, with very sparsely punctate 

 pronotum. 



EXPLANATION OF PLATES 

 Beetles enlarged about three times ; aedeagi, about eight times 



Plate 1 



Figure 1. Trirhabda Mcharidis (Weber). 



2. Trirhabda canadensis (Kirby). 



3. Trirhabda adela Blake. 



4. Trirhabda virgata LeConte. 



5. Trirhabda borealis Blake. 



6. Trirhabda neoscotiae Blake. 



7. Trirhabda convergent LeConte. 



8. Trirhabda viridicyanea Blake. 



9. Trirhabda pilosa Blake. 



10. Trirhabda atteniiata (Say). 



11. Trirhabda leicisii Crotch. 



12. Trirhabda nitidicollis LeConte. 



12a. Trirhabda nitidicollis var. LeConte. 



13. Trirhabda eriodictyanis Fall. 



14. Trirhabda diducta Horn. 



Plate 2 



15. Trirhabda luteocincta (LeConte). 



16. Trirhabda confusa Blake. 



17. Trirhabda labrata FalL 



18. Trirhabda sericotrachyla Blake. 



19. Trirhabda flavoUmbata (Mannerheim), 



20. Trirhabda nigrohumeralis Schaeffer. 



21. Trirhabda caduca Horn. 



22. Trirhabda geminata Horn. 



23. Derospidea brevicollis (LeConte). 



24. Derospidea ornata (Schaeffer). 



2.5. Derospidea cyaneomneulata (.lacoby). 



26. Coraia subcyanescens (Schaeffer), 



27. Monocesta coryli (Say). 



U. S. GOVERN MF.NT PRIHIiNS OtflCE .^<iH 



