443 



of the emulsion iu the same proportion was repeated, the rain having 

 vitiated the preceding application. This spraying we believe affected 

 the final and complete extermination of the scales, but as the trees 

 stood these applications without injury, to put the matter of extermina- 

 tion beyond doubt, and as a final precaution, they were again all sprayed, 

 and were shipped October 10. 



It will be noted that the earlier sprayings were practically successful* 

 90 to 95 per cent of the scales eventually dying; but in this instance 

 it was essential that not a single scale should escape or the work would 

 have been valueless, and hence the necessity of the additional treat- 

 ments. A further outcome of these experiments is the very evident 

 fact that the Date Palm is not apt to be injured even by the application 

 of very strong kerosene washes, repeated at comparatively short 

 intervals. 



A VIVIPAROUS COCKROACH. 



Bv C. V. Riley. 



On page 129 of No. 1, vol. ii, Proceedings of the Entomological So- 

 ciety of Washington, I have published a short note under the above 

 title, reciting the fact that a female specimen of PancUora viridis, a 

 large green tropical Cockroach, found commonly 

 in South America and the West Indies, had been 

 sent me [September 21, 1890] by Dr. Carl F. Giss- 

 ler, of Brooklyn, New York. He had found it in 

 Brooklyn alive on a cabbage head, and having put 

 it into a box until the next morning, it was then 

 discovered to have died over night, and that out 

 of its genital orifice had crept some two dozen live 

 young ones. As stated in the note before the En- 

 tomological Society, the specimens interested me 

 greatly because, so far as I had been'able to as- 

 certain, there is no record of a viviparous Cock- 

 roach, and after a careful examination, involving 

 a dissection of the abdomen of the specimen, I saw 

 no reason to doubt the accuracy of Dr. Gissler's statement. Several of 

 the young had already been born as above stated, but still others were 

 in the abdomen ready to emerge, with no trace of either eggs or egg- 

 case. 



Mr. S. H. Scudder, who is most familiar with the Orthoptera, as well 

 as with the general literature of entomology, writes in reply to a ques- 

 tion, under date of June 6, that he does not recall having seen any 

 similar fact recorded. He has called my attention to the following 



Fig. 32. — Panchlora viridis, 

 adult, enlarged (original.) 



