242 



MONOGRAPH OF THE LABOULBENIACEiE. 



orders other than Coleoptera are doubtless largely represented. This is indicated by 

 the fact that two among the small number of tropical forms at present known occur 

 on such peculiar and unusual hosts as those of Laboulbenia armiUaris and L. Ilageni, the 

 one a mite, the other a white ant. Southern California also furnishes an instance of 

 the occurrence of a peculiar form on a host, Chilocorus, quite unrelated to any of the 

 usual genera of insects thus parasitized, and it must be remembered that the Diptera 

 have hardly been examined at all in this respect. It thus seems not improbable, in 

 view of the above facts, and of the more favorable conditions for development and 

 perpetuation which exist in the warmer regions of the earth, that we may look to them 

 for a large, if not the largest, future addition to the group ; for that the family is des- 

 tined to be greatly augmented can hardly be doubted. 



Including a small number of forms not enumerated in the succeeding pages, from 

 lack of proper material for description, the total number of Laboulbeniaceaa known at 

 present to exist includes one hundred and fifty-eight species, from which five perhaps 

 might well be deducted as synonyms, distributed among thirty genera, three of which 

 are undescribed. Of these one hundred and thirteen are, so far as known, confined 

 to North America, eleven to Europe, eight to Africa, three each to Asia and South 

 America, including Panama, while two are peculiar to Australia. On the other hand, 

 nine are common to North America and Europe ; two to North and South America ; 

 one to North America, Europe, Asia, and probably to Africa ; one, the determination 

 of which is perhaps doubtful, to North America, South America and Africa, including 

 Madagascar; one to South America and Africa; one to North America, Europe and 

 probably to Asia ; and, lastly, one to Africa and Asia (Japan). 



Turning to the genera, one finds that of the twenty-five which are known in 

 North America, twenty are not recorded from other continents ; that of the six 

 genera known in Europe, two have not been found elsewhere ; that of four genera 

 known from Africa, two are indigenous ; while of the two Asiatic genera, one is con- 

 fined to that continent. Lastly, South America and Australia are each known to 

 possess but the single genus Laboulbenia, which is universally distributed. 



It is needless to remark that these statistics have little or no value as showing the 

 actual relative distribution of the species and genera in the several continents, and 

 they are merely given to indicate the possibilities of distribution in so far as our im- 

 perfect knowledge will permit. For convenience of reference a table giving in more 

 detail the facts of relative distribution outlined above is here appended : — 



