MONOGRAPH OF THE LABOULBENlACEiE. 



313 



it is not clear from Peyritsch's account in what respects this species differs from L. flagellata. 

 The only peculiarity of the former species appears to he that cell 111 is unusually elongated; 

 yet this may have hcen accidental or due to careless reproduction. That the typical elongata 

 occurs in Europe on Platynus (Anchomenus) as well as on Priitonyehui cavicola is an 

 undoubted fact, the L. gigantea of Istvanffi being identical with the most typical forms of elon- 

 gata, and the material which I.have seen derived from species of Platynus taken in the neighbor- 

 hood of Vienna, seems also not separable from the same form. The retention of the species as 

 distinct from L. flagellata and L. anceps is therefore provisional, and it may prove that all three 

 are the same. 



The variations of L. elongata, which are very numerous and are in part represented on Plate 

 XVI, appear to be due in part to the character of the individual host attacked and partly to the 

 position in which the plant grows ; this species illustrating better than any other the variations 

 which have been previously alluded to (p. 240) as dependent on these circumstances. In brief, 

 the species may be very elongate (more than a millimetre in length from the foot to the apex of 

 the perithecium) or very short (300 or even less) and stout ; in color it may vary from pale 

 straw color to deep brown, specimens sometimes occurring that are nearly opaque ; the append- 

 ages may be short and stout or very long and slender, sometimes almost simple, in other cases 

 very densely branched, hyaline or opaque, yet conditions showing every gradation between these 

 extremes are so numerous as to render the separation even of varieties impossible. 



One of the short stout varieties that occurs on the legs of Platynus cincticollis was formerly 

 thought by me to be a form of L. Rougetii, but it seems certain that this variation is merely due 

 to the position of growth, since it occurs also on the jaws of the host as well as when the para- 

 site grows crowded at the tips of the elytra. The type-form is that which grows as a rule near 

 the base of the legs on the inferior surface of the thorax, and is represented in fig. 4, Plate XVI. 

 It is one of the commonest of all the species as well as the most widely distributed, and it is to 

 be hoped that its great variability will not lead to an extended synonomy in the future. 



Laboulbenia flagellata Peyritsch. 



Peyritsch Sitz. d. Wien. Acad. LXVIII, p. 247, Plate I, figs. 1-3 ; Sorokin Veg. Paras. Vol. II, p. 415, Plate XXXII, fig. 765; 

 Winter's Pilze Deutsch. II, p. 921 ; Berlese, Malpigliia, III, p. 55 ; also in Saccardo Sylloge Fuug. Vol. VIII. p. 910. 



" Light yellowish brown, only the mamilla of the perithecium blackish about its base ; 

 pseudoparaphyses few in number (4-7), about equal, simple or divided at the base, colorless, for 

 the most part exceeding the perithecium in length." 



On Bembidium lunatum Duft., Anchomenus albipes P., A. marginatus L. 



The above description is taken from Peyritsch, but is quite inadequate as a means of deter- 

 mining the species ; which, as has been previously mentioned, may have to be united with L. 

 elongata. I have never in my own experience seen any species like it on members of the genus 

 Bembidium. 



