36 PERCY SLADEN TRUST EXPEDITION. 



20. Dysdercus ortus, sp. n. (Plate 4. fig. 13.) 



Head and rostrum testaceous red, the latter with the apical joint piceous or black ; 

 antennse black, extreme base of first joint testaceous red; prouotum ochraceous,witha large 

 black subquadrangular patch occupying basal half of disk but not reaching the posterior 

 or lateral margins, lateral margins connected with a broad transverse subanterior fascia, 

 testaceous red; scutellum black, its apex sometimes testaceous ; corium pale ochraceous, 

 with a transverse black spot on each tegmen near apex of claval suture ; membrane 

 black, the margins very narrowly greyish ; sternum testaceous red, anterior and posterior 

 margins of prosternum, posterior margins of meso- and metasterna, and the acetabula 

 ochraceous, lateral areas of meso- and metasterna more or less black ; abdomen beneath 

 ochraceous, anterior segmental margins more or less black, the lateral margins irregularly 

 testaceous red ; legs black, coxae, trochanters, and anterior femora beneath testaceous red ; 

 first, second, and fourth joints of antennae subequal in length, third shortest ; anterior 

 margin of pronotum posteriorly closely wrinkled, the space represented by the subanterior 

 red fascia convexly raised and profoundly incised at each margin, the lateral margins 

 somewhat laminately reflexed, the black disk obscurely punctate and with a central 

 pale longitudinal line ; scutellum moderately globose ; corium thickly punctate, anterior 

 femora finely spined beneath and with two prominent spines near apex; rostrum 

 reaching middle of abdomen. 



Long. 12 to 14 millim. 



Locality. Praslin, Cousin Isld. 



The collection contained a fairly long series of specimens of this species, all of which 

 are quite constant in character. 



Family HydrometridaB. 



Subfamily Hydrometrinse. 



21. Hydrometra ambulator. 



Hydrometra ambulator, Stal, Ofv. Vet.-Ak. Fcirh. xii. ji. 45 (1855). 

 Mahe. — Also found in Southern Africa. 



Subfamily Veliinse. 



22. Rhagovelia nigricans. 



Velia nigricans, Burm. Handb. ii. p. 213 (1835). 

 Mahe, Praslin. — Also recorded from Rodriguez, Abyssinia, Egypt, Syria, and Ceylon. 



