EEPOET ON A COLLECTION OF DIPTEROUS INSECTS 

 FROM PUERTO RICO. 



By D. W. COQUILLETT, 



Custodian of Ihe Diptera in the TJ. S. National Museum. 



During the months of January and February, 1899, Mr. August 

 Busck, of the U. S. Department of Agriculture, through the courtesy 

 of the U. S. Fish Commission, visited various portions of Puerto Rico, 

 and among other things collected quite a large series of dipterous 

 insects, which were later deposited in the U. S. National Museum. 

 This series comprises 864 specimens, representing 117 species, distrib- 

 uted in 79 genera and 31 families. Three of the genera and sixteen of 

 the species appear to be new to science, and are duly characterized in 

 the following pages. Fifty-one of the species, nearly one- half of the 

 whole number, also occur in the United States proper, several of them 

 ranging as far northward as the State of New Hampshire. Twenty of 

 the others have not as yet been reported as occurring outside of Puerto 

 Rico, while the remaining forty-six species have also been obtained in 

 some other island of the West Indies or in Central or South America. 



Only a very few species of Diptera were described from Puerto Rico 

 by the older authors, and it was not until the year 1885 that any con- 

 siderable number of species were reported from that island. In that 

 year Herr Victor von Roeder, of Hoym, Germany, published a list, with 

 descriptions of new forms, of a series of these insects collected by Con- 

 sul Krug.^ This list numbers 111 species, of which 76 are different 

 from those obtained by Mr. Busck; adding these to the 117 species 

 obtained by the latter gives a total of 193 species now known to occur 

 in Puerto Rico. 



The report in detail is as follows : 



Family CECIDOMYIID^. 



DIPLOSIS COCCIDARUM CockereU. 



Twenty specimens bred from larvae associated with Dactylopius citri, 

 and nine specimens bred from Leeanium hemisphaericum; also a single 

 specimen captured at Mayaguez in January. This species was origi- 



^ Entomologische Zeitung zu Stettin, 1885, pp. 337-349. Republished, with notes, 

 by Seuor Juan Gundlach in the Anales de la Sociedad Espanola de Historia Natural, 

 1887, pp. 177-199. 



Proceedings U. S. National Museum, Vol. XXII— No. 1 1 98. 



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