MONTEZUMIA. 115 



above by the meeting of the anterior and superior faces of the 

 segment. The second segment widening toward its base in an 

 ovoid form. 



The insects of this division have somewhat the appearance of 

 Discoelius, on account of the form of their abdomen, but the 

 labial palpi are distinctly composed of three articles only and the 

 maxillary of five. 



4. M. Huasteca Sauss. (Fig. 9 %, 9a £.) — Nigra, nitida, dense 

 punctata; pronoto cristato-marginato; metanoto et abdom. 1° seguieuto 

 grosse cribratis ; inesonoto et abdom. 2° segmento tenuiter punctatis ; 

 clypeo longiore quam latiore, bidentato striato-punctalo ; metanoto 

 rotundato, in medio excavato, foveola striata, baud acute marginata 

 1 instructo; abd. primo segmento angusto, campanulato, supra nodoso 

 inflato; scutelli et postscutelli fascia interrupta, abdominisque seg- 

 menti l'-2' (quandoque 3') margine, fulvis ; alis hyalinis costa nigra ; 

 antennarum flagello subtus ferrugineo. 



% . Clypeo flavo, an tennis uncinatis. 



Montezumia huasteca Sadss. Rev. et Mag. de Zool. 1857, 271. 

 Total lengtb, 16 mm.; wing, 13 mm. 



Appearance of a Discoelius; clypeus more long than wide, 

 bidentate ; the teeth distant, separated by a straight or concave 

 margin ; ocelli large, approaching ; a deep groove on the vertex. 

 Prothorax strongly rimmed, ungulate; scutels flattened, divided 

 by a feeble line, separated by a strong sulcus. Metathorax 

 forming two convex cheeks behind the post-scutel, but its poste- 

 rior face occupied by au almost round fossette, regularly exca- 

 vated, shining and striate, slightly punctured, garnished with a 

 gray pile, but without decided border or limiting marks. Lateral 

 ridges effaced. First segment having its anterior fourth pedicu- 

 late in form and the remainder campanulate, quadrate, nodulously 

 swelled above ; (seen in profile this segment has the appearance 

 of carrying a great tubercle, which results from the meeting of 

 the superior with the anterior face at a right angle): this segment 

 less than half the width of the second and offering above a 

 depressed point ; second segment rounded, depressed, flat 

 beneath, convex above, enlarging gradually. Head, thorax, and 

 petiole densely punctured ; the prominences of the metathorax 

 and the first abdominal segment cribrose with large punctures; 

 the mesothorax not strongly punctured ; the head punctured, 



