of Dytiscida Darwinians. 5 



2. (3.) C. nigro-rematus, Bab. 

 Oblongo-ovatus, supra flavicans, subtus niger, abdomine flavo, 



vertice nigro, elytris crebre nigro-reticulatis striisque disci 

 punctatis ; antennis pedibusque pallidis, tarsis posticis nigris 

 exceptis. (L. c. 4| ; lat. 2j lin.) 

 Head, antennae, and thorax as in the preceding insect; but the 

 latter is wholly yellow, with the exception of two minute black 

 spots on the hinder margin, Scutellum as in the last. Elytra the 

 same, but the yellow outer margin is broader, and the reticula- 

 tions are less regular. Breast black. Abdomen yellow, with the 

 centres of the segments ratlier dusky. Legs pale, with the excep- 

 tion of the posterior tarsi, which are black. 



There are two specimens of this insect in the collection ; one 

 from Port Famine, on the east coast of Patagonia, has smooth 

 shining elytra, and all the appearance of a male insect, but it has 

 not dilated tarsi ; the other from Port Desire, on the same coast, 

 has the strigose dull elytra, tarsi, &'c. of a female. This species 

 is closely allied to C. reticulatus, but may be distinguished by its 

 pale thorax with two minute spots, and the pale abdomen. Can 

 it be a variety of that insect ? 



3, (4.) C. Chiliensis, Laporte ? 

 Oblongo-ovatus, supra flavicans, subtus niger, capite thorace 



antice postice maculdque oblonga transversa disci nigris, 

 elytris crebrissime nigro-reticulatis, striisque disci punctatis, 

 antennis flavis extrorsum fuscis, pedibus fuscis, (L, c. 5^ ; 

 lat. 2| lin,) 



C. Chiliensis, Lap. Etud. Ent. 100? 



Head black, the anterior margin and labrum flavous. An- 

 tennae flavous at the base, becoming gradually darker towards the 

 apex. Structure of the thorax as in the preceding. The ante- 

 rior and posterior margins black, and a large broad transverse 

 rectangular black spot on the disk, between which and the base 

 is a row of minute black dots. Scutellum totally black ; elytra 

 ovate, very slightly dilated, with the usual striae, formed of few 

 distant punctures, flavescent, very thickly reticulated with black ; 

 the lateral margins^ and a very narrow line down the suture, im- 

 maculate. Body beneath wholly black. Legs fuscous, the inter- 

 mediate femora thickly and coarsely punctured. 



Distinguished from the preceding species by its black head, 

 the spot on the thorax, &'c. Found at Valparaiso in Chili, one 

 of the specimens at an elevation of 5000 feet above the sea. 



