THAXTER. — 



MONOGRAPH OF TIIIO LAHOULHKM 



341 



to that of the outer, and producing usually two .simple or once branched branches placed antero-posteri- 

 orly, the ultimate branchlets in both appendages elongate, tapering slightly distally, hyaline. Perithecia 

 95-105 X 35-40 \i. Total length to tip of perithcciuin, average 190 /<; to insertion-cell 120 //. Ap- 

 pendages, longest, 300 p. 



On Aniaodaetylvs trieuspidatus A. Mor., Paris Museum, No. 199, Mon-Pin, (China?). Margin 

 of (he elytra. 



This species is nearly allied to L. filijera and L. Mrogenidii, representing an intermediate type between 

 the two. The appendages are practically identical with those of the latter species, while the perithcciuin, 

 though peculiar for the irregular bulging of its very blunt tip, is more like the former. The position of 

 growth is the same in all three species and the hosts are nearly allied. 



Laboulbenia obtusa Thaxter. Plate LIV, fig. 1. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 189. Dec, 1899. 

 Perithcciuin about three fourths free, becoming opaque, black-brown, very stout, the outer margin 

 slightly and more or less symmetrically convex, the inner bulging prominently distally and curved abruptly 

 to the brown blunt rounded hardly differentiated apex, the pore external. Receptacle short, cell VI 

 together with the basal cells of the perithcciuin concolorous with the latter, becoming indistinguishable; 

 cell VI extending to or towards the base of cell II, which is mostly suffused above, hyaline and contrasting 

 below as is cell I; cells III and IV with median brown shades. Insertion-cell black-brown. Appendages 

 hyaline becoming tinged with brown, the outer basal cell twice as long as the inner, each bearing one to 

 two branches which form a compact group curved toward and against the perithcciuin. Perithcciuin 

 120 X G5 [i. Total length to tip of perithcciuin, average 200 fi; to insertion-cell 175 p. Appendages, 

 broken, 35 u. 



On Acrogenidion Bedell Tsch., Paris Museum, No. 198, Mon-Pin, (China?). On left inferior 

 margin of prothorax. 



This species is most nearly related to L. filijera and L. intermedia, but differs from both in the form 

 of its stout opaque perithecium. In perfect specimens the appendages are no doubt longer than they 

 are represented in the figure; but probably do not attain the great length of fUifera, as may be inferred 

 from the fact that they are strongly curved towards the perithecium. 



Laboulbenia filifera Thaxter. 

 Specimens apparently identical with the American material have been obtained from the Paris Col- 

 lection No. 12, on Harpalus aneus from Selenga, Siberia; and in the British Museum No. 617 on Pangus 

 sp., from Germany. The allied Chinese forms L. obtusa, L. intermedia and L. Mrogenidii have been 

 referred to above. All of these forms occur on the margin of the elytron, near the middle and towards 

 the base. 



Laboulbenia Casnoni.e Thaxter. 

 This species appears to be separable from forms of L. polyphaga with which it might be confused, 

 by its subcorneal perithecium, simple outer appendage, and more or less copiously branched inner ap- 

 pendage. Although it is not a well characterized species, it seems best to keep it distinct, at least pro- 

 visionally. The additional material examined is as follows. British Museum, No. 500 on Ophionea 

 sp., Adelaide, x\ustralia; No. 499 on Ophionea cyanocephala Fabr., Daccu, India; No. 501 on Casnonia 

 Pennsylvania Linn., Ohio. Hope Collection; No. 270 on Homothes elegans Newm., "India," No. 27G; 

 on Demetrius atricapillus Linn., Morocco; No. 277 on D. imperialis Mey., no locality; No. 340 (bis) 

 on Dromius longipes Dej., England. The type form has also been collected again by myself on Casnonia 

 at Kittery Point, Maine. It should be noted that the hosts above enumerated are for the most part nearly 

 allied. 



