1894.] HEMIPTERA-HETEROPTERA OE GRENADA. 169 



A large number of specimens of the Hydrobatid^e were found, 

 but represent only four species. They were met with more especially 

 near the sea-coast on the flat lands and marshes. 



A form closely related to Kheumatobates adds another to the 

 growing list of these remarkable insects. It is a matter of regret 

 that only one mature and winged specimen of this curious form 

 was taken, and it is unfortunate that no observations were made 

 respecting its mode of life and the peculiai'ities of its habitat. 

 The pale and membranous character of its wing-covers give it the 

 appearance of a small and slender wasp, so that this peculiarity 

 of aspect might be of some service in protecting it from enemies 

 which it must meet with in the water where it dwells. 



The other palustrine and aquatic forms here enumerated are 

 mostly common species which have an extensive distribution 

 throughout the regions between Northern Brazil and the southern 

 United States. 



The presence of only two species of Corisa seems remarkable in 

 a region where shallow placid and sluggish waters abound and 

 form such suitable homes for this type of insect. 



It is also difficult to account for the absence of a large number 

 of forms of Galgulus, Mononyx, and Notonecta. These hardy insects 

 abound in just such places as are mentioned above ; as for example 

 on the marshes, turbid sands, about the slime on the borders of 

 sluggish waters, and among the roots of grass and slender plants 

 in wet places. 



In comparing this assemblage of species with that of the island 

 of St. Vincent, the differences between them do not seem sufficient to 

 warrant their separation into two faunas. The most divergent form 

 from the general average is the remarkable Alydid, Darmistidus. 

 This form was not among the collections from Grenada, and it is 

 not like any that has yet been brought from any part of the 

 American continent or its islands. 



This collection adds valuable information supplementary to our 

 previous knowledge of the faunas of the Greater Antilles, Mexico, 

 Central America, and Colombia ; but much further research 

 will be required before we can satisfactorily recognize the limits 

 of the great areas of distribution of the Hemiptera south of the 

 United States. 



PaCHYCORIDjE. 



Agonosoma, Lap. 



1. Agonosoma elavolineata, Lap. 



Agonosoma jlavolineata, Lap. Hemipt., Mag. de Zool. ii. p. 69. 



Examples of this species were collected at Balthazar, April 6, 

 at an elevation of 250 feet above the sea, from foliage along the 

 road, on dry ground, in woods of second growth. On April 30 a 

 specimen came to the light at night. Other specimens were found 

 on the La Porce estate, August 17, on open damp ground under 

 piles of weeds. On the Caliveny estate they were swept, September 

 17, from herbage on low open ground. 



