WHAT IS MONOPHLEBUS. 317 



1830, but the ' Avant-propos ' is subscribed Nov, 15th, 1838, by 

 Guerin Meneville, and this year is the actual date of the text, as 

 is seen by a reference to the lepidopteral portion (p. 271, not 171, 

 as stated in the 'Avant-propos '), where Guerin mentions the dates 

 of publication of the various " livraisons " of the Atlas. Plates 

 x.-xii. (Rhynchota) were published in 1831, but the text not till 

 1838. It may be noted that Hagen (' Bibliotheca Entom.') cited 

 1829-32 as the date, but had not seen the work. The references 

 in Laporte and Boisduval are to the plates only. According to 

 Guerin, the second volume, by Boisduval, of the ' Voyage de 

 decouvertes de I'AstroIabe ' was published May, 1835. 



This will unfortunately necessitate some slight alterations in 

 my "Nomenclature," which will be effected at the end of part 1, 

 now in the press. 



WHA.T IS MONOPHLEBUS, Leach? 

 By T. D. a. Cockerell. 



In Entom., September, 1902, p. 232, I gave an account of 

 Monophlebus which I supposed would not need correction. Since 

 then, however, some facts have developed which call for a recon- 

 sideration of the whole matter. 



(1.) Mr. G. W. Kirkaldy wrote me that Monophlebus did not 

 date from Westwood's publication, but from Burmeister, Handb. 

 ii. p. 80, published in 1835. It is also to be remarked that 

 Westwood's paper dates not from 1845, but from 1842 {fide 

 Kirkaldy) or 1841 (according to a date pencilled by M. Wytsman 

 on the copy before me). 



(2.) The question arose, however, whether Leach himself 

 published Monophlebus at any earlier date. Prof. C. H. Fernald 

 has exhaustively investigated this matter, with the following 

 principal results : — 



(a.) Agassiz's ' Nomenclator Zoologicus ' cites "Monophlebus, 

 Leach, Probos. Ins. 1817." This doubtless refers to Eprobos. 

 Ins. (Wern. Soc), but Professor Fernald has examined this work, 

 as well as several others by Leach, and finds no reference to 

 Monophlebus. It seems very improbable that Leach ever pub- 

 lished the genus. Samouelle's ' Compendium,' 1819, has no 

 reference to Monophlebus. 



(b.) Latreille (' Families Naturelles du Regne Animal,' p. 429, 

 1825) published a genus " Monophlebe," with characters de- 

 rived from the male antennae. This name being only in the 

 vernacular has no standing, but in ' Dictionnaire Classique 

 d'Histoire Naturelle,' vol. ii. p. 99, published in 1827, the name 

 is published as Monophlebus. The male antennae are said to be 

 moniliform, and of about 22 joints, which is an error known to 

 have resulted from counting each joint as two, some as more. 



