August, '11] ROSENFELD: INSECTS IN SPANISH MOSS 407 



Remarks on Insects 



Summarizing, we find that there are just 60 genera, representing 

 65 species of insects, if, for convenience, we count the variety of 

 Anthonomus suturalis, taken on December 23d, as a species. That 

 Tillandsia usneoides exercises a strong attraction as hibernating quarters 

 for both insects and spiders is plainly shown by the large difference in 

 number of species found in winter and summer lots of Spanish moss, 

 and by the difference, even more striking, between the average number 

 of insects or spiders per ton for the two periods. Of the 60 genera and 

 65 species of insects found, 53 and 58, respectively, occur in winter, 

 while only 15 genera and species are found in summer. Seven genera 

 and species were found in the June lots which did not occur in the winter 

 lots, and these were found only in very small numbers. Nor is the 

 summer population found in the different lots of moss so regular as 

 that of the winter, only one species being found in four out of the five 

 summer lots of moss, and only three species in as many as two lots. 

 Eleven out of the fifteen species taken in June occur in but one collection 

 of moss, while just one half of the fifty-eight species taken during the 

 winter occur in two or more lots. 



By number of insects per ton the average populations of the winter 

 moss was 71,839, while the average of the summer lots is found to be 

 but 1,405 insects per ton. In winter the proportion of spiders per 

 ton to insects per ton is found to be as one to twelve, whereas in summer 

 it is as one to five. 



Of the insects taken from the six winter collections of moss 



29 species occur in 1 lot 

 10 species occur in 2 lots 

 3 species occur in 3 lots 



3 species occur in 4 lots 

 9 species occur in 5 lots 



4 species occur in 6 lots 



The most widely distributed insects taken during the winter, the 

 number of lots of moss in which they were found, and the average 

 number of insects per ton for the six winter lots, are given below. 



No. lots in Av. No. per ton 



Insect which found in 6 winter lots 



Cremastogaster lineolata 5 45,834 



Paromius longulus 6 11, 557 



Anthonomus suturalis 5 6 , 933 



Anthonomus grandis 5 1,313 



Lixus musculus 5 1 , 179 



Nezara viridula 5 «S84 



Bruchus cruentatus 5 489 



Nysius calif ornicus 6 469 



