Of the southern species, which in Chontales find their northern limit, so far as is known, there are in my small collection thirty-two species, whilst belonging to the northern sub-province, and not known to range further south, there are only seven species; showing that the connection with Costa Rica and the south is much closer than that with Guatemala and the north, and that the boundary between the two sub-provinces is not found, as was supposed, in the depression of the isthmus occupied by the great lakes and their outlet the San Juan river, but must exist further towards, if not in, Honduras. Mr. Salvin says, "What I suspect to be the case, though I cannot as yet bring evidence to prove it, is, that the forests of Chontales spread uninterruptedly into Costa Rica, but that towards the north and north-west a decided break occurs, and that this break determines the range of the prevalent Costa Rican and Guatemalan forest forms."* (* "The Ibis" July 1872 page 312.) I can confirm Mr. Salvin's supposition. The San Juan river forms no greater break in the forest than a dozen other rivers that run through it and fall into the Atlantic. But a decided interruption does occur to the north-west. It is found in the valleys of Humuya and Goascoran in Honduras, which, along with the central plain of Comayagua, constitute a great transverse valley running north and south from sea to sea, and cutting completely through the chain of the Cordilleras.* (* Squier "States of Central America" page 681.) The highest point of this pass is 2850 feet above the sea, and the country around is composed of undulating savannahs and plains covered with grass. The Gulf of Honduras, cutting deeply into the continent, also plays an important part in preventing the intermingling of the faunas of the two sub-provinces, but the principal barrier is the termination of the great Atlantic forest north-westward, which even at Cape Gracias begins to give place to plains and savannahs next the coast. (PLATE 25. LONGICORN BEETLES OF CHONTALES. 1. Evander nobilis, Bates. 2. Gymnocerus beltii, Bates. 3. Polyrhaphis fabricii, Thom. 4. Deliathis nivea, Bates. 5. Taeniotes praeclarus, Bates. 6. Chalastinus rubrocinctus, Bates. 7. Cosmisoma Titania, Bates. 8. Carneades superba, Bates. 9. Amphionyca princeps, Bates.)