192 ENTOMOLOGICAL NEWS. [Sept 



When males are not present the position of the strial punc- 

 tures of the elytron will readily separate the species. 

 Punctures of striae regular and well centered. 



Andrewsii. 



Punctures of striae confused and encroaching on the 

 intervals. Guyoti. 



This character pertains to the basal three- fourths of the 

 elytra, as the striae and punctuation become confused at the 

 apex in both species. 



But three authentic specimens of C. Guy at i have been ex- 

 amined, and possibly forty of C. Andrewsii, all forms, and no 

 deviation from the above rule occurs. 



There is a tendency in many specimens of C. Andrewsii to 

 a broadly augulated form of thorax as is shown by the accom- 

 panying plate, the series showing gradual development from 

 No. 4 to 9 in regular order. 



A series of C. Riding-m, Nos. 10, 11 and 12, is also utilized 

 to show the same character. 



Without types or authentic specimens at hand, and only 

 females present, the student can very easily go astray, as can 

 be seen by a glance at No. 9, a supposed Guyoti, or No. 5, a 

 small Andrewsii, whi(Ji could very readily be confused with 

 Ridingsii. The figures of plate show the comparative size of 

 the various species, and it will be seen that Giiyoti is much 

 larger than Andrewm, being quite as large as the larger form 

 of C. viduus. 



Specimens of the several species from Pennsylvania have 

 the thorax longer and narrower than those of North Carolina 

 and Tennessee. 



I am indebted to Dr. Henry Skinner for the excellent pho- 

 tograph of the specimens and to Mr. Roland Hayward for 

 careful comparisons with the Leconte specimens in the Cam- 

 bridge Museum. 



EXPLANATION OF PLATE. 



1. C Guyoti Lee. male (Horn Coll.). 



2. C Guyoti Lee female (Wenzel Coll.). 



3. C. viduus De.j . 



4. C. Andrewsii Harr. Pa. 



5. C. Andrewsii Harr. Va. 



6. C Andrewsii Harr. N C. 



7. C. Andrewsii Harr. N. C. 



8. C, Andrewsii Harr Sawyer's Springs, Tenn. 

 q C. Andrewsii Harr. N. C. 



10. C. Ridingsii Bland, type female. Va. 



11. ('. Ridingsii Bland, Pa. 



