241 



ETHMIIDAE 



The North American species of this family have been carefully 

 studied anew with the advantage of very large series of nearly all of 

 them; several were hitherto known from a few or single representa- 

 tives. All but one of the described species are figured on Plates XX\'I 

 and XXVII. We are under obligation to Rev. Joseph de Gryse of 

 Staunton, \'irginia, for the drawings which are photographed on Plate 

 XXVI. The genitalia are shown on Plates XXXI\', XXXV and 

 XXXVI. 



The value of the genitalia in this family was first demonstrated 

 by Dr. Harrison G. Dyar in his revisional paper (Jour. N. Y. Ent. Soc, 

 \'ol. X. p. 202-208, 1902) and his descriptions of these organs readily 

 enable the recognition of most of the species. A few species, sus- 

 pected by him to be synonyms, have proven to be so by further study 

 and the synonymy is given below. 



The genitalia of this family demonstrates clearly the value as 

 well as the limitations of photographic reproduction of these organs. 

 Some species exhibit an extraordinary diversity of these structures, 

 which can readily be recognized from a photograph, while other un- 

 doubtedlv distinct species have attained or retained a most remarkable 

 similarity in these highly developed structures, which is apt to confuse 

 in a study of the photographs if not accompanied by a careful com- 

 parison of the actual organs under the microscope. 



Ethmi.\ .\RCTOST.\riiYLELLA Walsingham. PI. XXVI, Figs. 10-11-12; 



PI. XXXIV, Fig. 6. 



1880, Proc. Zool. Soc. Lond., p. 88. 

 n. syns : 



Ethinia obscitrcUa Ceutenmuller. 



1888, Ent. Amer., Vol. IV, p. 29. 



Etitinia mcdiella Busck. 



1913, Jour. Ent. & Zool., Vol. V, p. 99. 



Large series clearly indicate that these names stand only for va- 

 rieties of one species, which grade into each other. The genitalia are 



