236 Dr. A. S. Packard, Jun., on Insects 



specimen was taken out of the water, it had occurred there by 

 accident. These insects do n<^t live in the water, hut aifect 

 the marshy ground sometimes adjacent to it. The specimen 

 is immature, lacking the black colour proper to tlie hemelytra 

 and wings, but having the clavus, except at its tip, the base 

 of the corium, and two or three streaks thereon black. The 

 ncrvures of the membrane arc simply brown. 



Hygrotrechus rohustus, n. sp. 



One female of this genus (belonging to the family Hydro- 

 metridic), very much mutilated, alone serves us for the present 

 notice. In form it resembles H. remujis^ Say ; but the abdomen 

 is more uniformly robust towards the tip. The head is dark- 

 brown, fuscous on the middle, sericeous pubescent on the sides 

 and beneath, with a pale arc on the impression at the base of 

 the vertex. Antennai robust, brownish ochreous, the second 

 joint just one-half as long as the basal one, the remaining ones 

 destroyed, llostrum brown, extending a very little way be- 

 hind the anterior coxa?. Eyes pale brown, large. Thorax 

 robust, pale brownish testaceous, beneath brownish ochreous, 

 sericeous ; the anterior lobe of })ronotum blackish, divided in 

 the middle by an ochre-yellow line ; each side, between the 

 eyes, adjacent to them is an abru])tly elevated rufous tubercle ; 

 the mesial carinate line feeble, becoming obliterated poste- 

 riorly ; humeri elongate-tubcrculate, quite prominent ; pleura 

 darker than the pectus. Legs robust, brownish ochreous. 

 nemelytra milky white, as long as the abdomen, the ncrvures 

 l)rownish ochreous. Tergum pale ochreous, brown at base, the 

 sutures and lateral raised edge brown ; connexivum with a 

 silvery depressed dot adjoining each suture, the apical pro- 

 cesses robust, of medium length, hardly acute. Venter smooth, 

 dark ochreous. 



Length, to tip of processes, 17 millims. ; breadth across hu- 

 meri 3 millims. 



Corixa decolor^ n. sp.* 



Pale testaceous, dirty amber-yellow above. Form of C. 

 Ideroglyphica^ Fieber, of Em'ope. Head large, cranium very 

 convex, prominent, carinate on the middle, the vertex acutely 



* The fact that bread is made by the Mexicans from the eggs of a brine- 

 iiiliabiting Corixa is noticed in Westwood's 'Classification of Insects.' 

 I'rnf. (>. C. Marsh has infonned me tliat these brine-insects are also noticed 

 Lv ]M. Virlet d'Aoust in tlie * liulletin dc la Societe Geologique de Frsince,' 

 1858, XV. p. 2U0, and also by E. B. Tylor in his ' Anahuac,' London, 18G1. 

 The latter says: "A favourite dish here [Tezcuco] consists of flies' eggs 

 (Curixa fcmorata and A'o(o)iccta tmifasciafa, according to Meneville and 



