March, 1904.] PROCEEDINGS OF THE SOCIETY. 63 



Verb. d. k. k. Bot. GeselL, LIII, 2, 3, 4. 



Boletino Mus. Paraense, Vol. Ill, 3 and 4. 



Tijdschrift voor Entomologie, I902, 3 and 4 ; 1903, I. 



Horse Societatis Entomologicae Russiae, XXXVI, I and 2. 



Bulletin Buffalo See. Nat. Hist., VIII, Nos. i, 2, 3. 



Ohio State Acad, of Science, special paper 7. 



Cold Spring Harbor Monographs, i, 2 (Brooklyn Institute). 



Melander : Synopsis of the N. A. Species of Ammophila. 



Chicago Acad, of Sciences, Vol. II, No. 4; Vol. Ill, 2; Vol. V. 



New Mexico College of Agriculture, Bulls. 44, 45 and 46. 



2ist and 22d Repts. State Ent. of the State of Illinois. 



Proc. Am. Phil. Soc, XLII, 172, 173. 



Proc. Am. Acad. Arts and Sciences, XXXVIII, Nos. 20, 21, 22, 23, 24, 25, 

 26; XXXIX, I, 2, 3. 



Phil. Soc. Wash., XIV, pp. 205-232, 1902. 



Ohio Naturalist, Vol. Ill, Nos. 6 and 8, 1903. 



Texas Acad, of Sciences, Vol. IV, Pt. 2, Nos. i, 2, 3, 4, 5, 6, 7, 8. 



Melander and Brues : Guests and Parasites of the Burrowing Bee Halictus. 



Trans. Connecticut Acad., XI, i, 2. 



West Virginia University Bulletin, 84, 85. 



Anales del Museo Nacional de Montevideo, Vol. IV, pp. 29-88, pp. 123-154. 



Mr. Engelhardt's paper was postponed until the next meeting of the society. 



Mr. Schaeffer then presented a paper on "A Collecting Trip to the Lower Rio 

 Grande." He stated that considerable interest had been awakened concerning the 

 insect fauna of this region by the collections made there by Messrs. Townsend, 

 Schwarz, Wickham, and Dietz. These collections contained a great number of either 

 entirely new species or species known to occur so far only in Mexico and Central 

 America. Prof. Townsend in his paper on the Biogeography of southwestern Texas, 

 Mexico, etc., estimated that only about 25 per cent, of the species known to him belong 

 to the semitropical fauna. 



Mr. Schaeffer, in company with Mr. Doll, visited this interesting region during 

 the past summer in the interests of the Brooklyn Museum. He found the conditions 

 for collecting excellent and the vegetation surpassing anything he had expected. 

 They began collecting in the middle of April but were disappointed in the results of 

 ■ their early collecting as they found very little which did not occur later in the season. 

 Mr. Townsend records the palmetto groves as the home of these semitropical species, 

 but Mr. Schaeffer found that they were more abundant in the densely wooded forests 

 of Mexican ebony trees along the banks of the resacas. From his experience he is 

 led to believe that the semitropical insect fauna follows the distribution of the Mexican 

 ebony. In these forests, as well as in the palmetto groves, are found shrubs and 

 even trees heavily overgrown with vines of different species and here are found many 

 insects either hiding between the leaves or feeding upon them, but which are not 

 exclusively found in these masses of vines. He obtained many of the same things 

 from branches of ebony, willow and other trees which were far removed from vine- 

 overgrown bushes. During the hottest part of the day insects were very scarce. 

 The branches of most bushes and trees are armed with spines or thorns which make 

 collecting, especially in the more densely wooded places, very unpleasant. Often 



