THAXTEK. 



MONO(iRAI'II OF Til 10 LA HOULBI0N I A( '10/10. 



331 



Laboulhenia I'kolii khans Thaxter. 



This species presents ;i plexus of variations, several of which it has seemed desirable to distinguish 

 by varietal names and some of these like the var. cineta or var. atrata might be considered by some persons 

 as specifically distinct. But although these seem very constant, for example on a given host from a 

 given locality, there an' so many of them and they are otherwise so variable that it has appeared wiser to 

 regard them all as representing a single species which is undoubtedly in a very plastic condition, and 

 from which a number of species are likely eventually to separate themselves. Whether such a separa- 

 tion has not actually begun is perhaps a matter of opinion. If we take the well defined African form 

 Var. atrata, it might well be considered specifically distinct from the normal form as it occurs for instance 

 on Asiatic species of Chlwnius; yet the var. interposita on African Chlwnii, which approaches atrata very 

 closely, becomes identical with the Eastern form on Chlwnius when, as actually occurs in a few individ- 

 uals, the blackened septa are absent at the bases of its acessory appendages; while var. d i rarirata , again, 

 could hardly be separated from atrata if these blackened septa were added. 



Among the minor variations which I have seen the following deserve mention. British Museum 

 No. 604 on Chlwnius pall i pes Gebl. from Japan differs in possessing a receptacle the lower part of which 

 is very slender, cell I being nearly isodiametric, slender, usually abruptly curved above its base, with a more 

 or less well marked prominence distally and anteriorly just below cell II. 



Berlin Museum No. 918, on Brachionychus sublaevis Chaud. from Salang I., Siam, though not other- 

 wise peculiar, has an outer appendage similar in type to that of L. spiralis or L. flaccida (Plate LVIII). 



Berlin Museum No. 930, on Chlwnius xanthaerus Wied., from Bengal, is a small form, the distal 

 portion of the receptacle relatively large and diverging from the relatively small perithecium. 



British Museum No. 596 on Clwniomus gracilicollis Jnk. from Turkestan, is a pale form peculiar 

 for the characteristic wine-red color of its insertion-cell. 



Hope Collection on Chlwnius sp. No. 320, from Ceylon, has copious accessory branches, which are 

 hardly divergent, and 750 u in length. 



Minor variations in color, size and form of the receptacle, perithecium and appendages are common, 

 as well as in the degree of proliferation in cell V (which is rarely quite normal), the number of accessory 

 appendiculate cells cut off rarely exceeding five and usually not more than two in number. 



In a few individuals of the normal type (Paris 51, on Chlwnius sp., Algeria, and No. S3 on Eudema, 

 Africa, the subbasal cell of the receptacle has organized procarps and perithecia, and in one case two 

 have arisen after a division of this cell. This appears to occur usually when the primary perithecium 

 aborts for any reason, or is destroyed; but in one instance both primary and secondary perithecia appear 

 to be functional. 



A complete list of the material examined since the publication of my Monograph, and exclusive of 

 the named varieties, is as follows; — British Museum: No. 5SS on Eudema conica Murr., Old Calabar, 

 Africa; No. 589 on E. microcephalus Dej., Sierra Leone; No. 596 on Chlwniomus gracilicollis Jnk., Turke- 

 stan, No. 598 on Chlwnius spoliatus Rossi, Andalusia; No. 601 on C. marginellus Dej., Delagoa Bay, Africa ; 

 No. 603 on C. wneipennis, Port Natal, Africa; No. 604 on C. pallipes Gebl., Japan; No. 605 on C. bimacu- 

 latus Dej., Java; No. 608 on C. viarginatus Dej., Hong Kong; Xo. 610 on Rhcmbus sp., W. India. Paris 

 Collection: No. 20 on Chlwnius sp., Madagascar; No. 51 on Chlwnius sp., Algeria; No. 83, on Eudema 

 sp., Africa; No. 87 on Chlwnius sp., Java; No. 134 on Chlwnius sp., Japan; No. 140 on Chlwnius sp., 

 Asia. Hope Collection: No. 320 on Chlwnius sp., Ceylon; No. 335 on Craspedophorus sp., \A*est Aus- 

 tralia; No. 3S1 on Eudema Eriehsonii Hope, Africa. Berlin Museum: No. 918 on Brachiontjchus 

 sublwvis Chaud., Salang Island, Siam; No. 923 on Chlwnius biguttatus Motsch, Japan; No. 929 on C. 

 Schaumii West., "Tranquil" : No. 928 on C. Javanus Chd., Java; No. 924 on Chlwnius sp., New Guinea ; 

 No. 930 on C. xanthoccrus Dej., Bengal. Sharp Collection; No. 1106 on Phcropsophx* Hispanica Dej. 

 Spain; also on Chlwnius velutinus Duft., from Italy? in the Florence collection. The specimen on 



