504 HEMIPTEROLOGICAL GLEANINGS 



brown, the posterior mostly white. Adomen blackish edged with white. 

 Elytra infuseated in each of the areoles; nervures strong, white at base, 

 infuscated at apex; wings white with slender fuscous nervures. 



Described from one male taken at Trenton, Ont., August 

 17th 1911, by Mr. J. D. Evans, to whom I am indebted for 

 many interesting Hemiptera from Ontario. The white color of 

 this species with fuscous mottlings will at once distinguish it 

 from any other described form. 



On the genera Delphax and Liburnia. 



A consideration of the facts given below convinces me that 

 we must use the name Liburnia Stal for the large group of spe- 

 cies of which pellucida may be taken as the type; that Delphax 

 must take crassicornis Fabr. as its type and that clavicornis is the 

 type of Asiraca L,atr. Of these three genera the earliest, Asi- 

 raca, was described by L,atreille in 1796 under the name Cercopis 

 (Precis, page 91) which he changed to Asiraca in the page of 

 addenda at the end of the same volume. Like all the genera in 

 this rare work it was described without mention of species. Two 

 years later Fabricius (Ent. Syst., Suppl., page 511, 1798) rede- 

 scribes the genus as Delphax and on page 522 of the same volume 

 describes two species: 1, crassicornis and 2, clavicornis. In 1801 

 L,atreille (Hist. Nat. des Crust, et Ins. in, page 259) again 

 describes it as Asiraca with species clavicornis, crassicornis and 

 longicornis, which latter, however, he never describes. In 

 another two years Fabricius again characterizes it as Delphax 

 (Syst. Rhng. page 83-84, 1803) and adds eight new species 

 while the very next year Latreille (Hist. Nat. des Crust, et Ins., 

 xn, page 316) for a third time describes it as Asiraca with nine 

 species and complains that Fabricius in redescribing his genus 

 has unwarrantably changed its name to Delphax. However in 

 1807 (Gen. Crust, et Ins., in, page 167-168) he tries to 

 straighten out the matter by adopting Delphax for pellucida and 

 its allies and retaining Asiraca for clavico/jiis and its allies. This 

 procedure he still further clinches in 1810 (Consid. Genl., page 

 434) by naming clavicornis as the type of Asiraca and striata (*) 

 as the type of Delphax. This would settle the standing of these 

 two genera were it not that by the rules of the International Code 

 Asiraca has no standing until 1801, because no species was 



* I fail to find this species in the Oshanin Catalogue. Germar in 1818 

 seems to be the last to record it although it is listed as a Liburnia by 

 Stal in 1S69. 



