124 



ENTOMOLOGICAL NEWS. 



[March. '13 



Noteworthy Variations in the Elytral Tracheation 

 of Cicindela (Coleop.). 



By VICTOR E. SHELFORD, Chicago, 111. 

 The elytral tracheation of the Cicindela has been observed 



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by the writer in about one hundred species. The elytra of the 

 newly emerged imagoes of ten North American species have 

 been studied in some detail. Nearly all the common North 

 American species and about fifty exotic species have been 

 studied in less detail by mounting dried elytra in hot Canada 

 balsam containing little or none of the usual solvents. The 

 main tracheal trunks and some of the branches remain clear- 

 ly visible in such mounts for several hours. 



5 



7 



8 



10 



Fig. i. Typical arrangement of the main elytral trunks. 

 ' 2. Variation of rare occurence in C. Innbalis Klg. 



' 3, 4, 5 and 6. Tracheation of Cicindela pitnctulata Oliv., showing posterior bend- 

 ings and branching of the radius, the substitution of cross for longitudinal 

 tracheae, and (in 4) a posterior branching of the subcosta. 



T.C. princeps var. ducalis Horn (India) ; 8. C. limbalis Klg. ; 9. C. campestris 

 Linn. (Europe); 10. C. silvicola Dej. (Europe). 



