376 LAMELLICOENIA. 



3. Cremastochilus mexicanus. 



Cremastochilus mexicanus, Schaum, Germans Zeitschr. iii. p. 256; Ann. Soc. Ent. Fr. 1844, t. 11. 



fig. 8 1 ; Burm. Handb. der Ent. iii. p. 682. 

 Cremastochilus Villadce, Duges, La Naturaleza, iv. p. 174 (1879) 2 . 



Hab. Mexico \ Northern Sonora (Morrison), Guanajuato 2 (Salle, ex coll. Duges). 



The single example received from Morrison differs from the one from Guanajuato only 

 in the reddish-testaceous clypeus and legs ; the two agree in all details of structure. 



4. Cremastochilus crinitus. 



Cremastochilus crinitus, Lee. Trans. Am. Ent. Soc. v. p. 55 a ; Horn, Proc. Am. Phil. Soc. 1879, 

 p. 390, t. 4. fig. 6 2 . 



Hab. North America 1 2 . — Mexico, Chihuahua city (Hbge). 



One example only, agreeing well with Dr. Horn's description and having the long 

 hairs of the upper surface in a good state of preservation. 



LISSOMELAS. 



Magnus, elongato-oblongus, supra planatus, omnirto depilatus, fere impunctatus. Caput usque ad medios oculos 

 in thoraee retractum, supra fere planum, clypeo lateribus deflexis margine antice medio reflexo. Oculi 

 plani. Mentum late transversim ovatum, fere planum, inaequale, margine minime elevato apice angulatim 

 prolongate Antennae breves, artieulis 3°-7 m brevissimis gradatim valde latioribus. Mandibulae parte 

 membranacea lata supra penicillata; maxillae sicut in Cremastocliilo. Thorax relative parvus, subtra- 

 pezoideus, lateribus parum arcuatis, angulis anticis nullis, posticis rotundatis, medio basi leviter sinuato. 

 Pygidium utroque sexu apice convexum. Pedes mediocres ; tibiae anticse valde, 4 posticse minus, triquetral, 

 medio extus unidenticulatse ; tarsi mediocres, supra et subtus eleganter plurisulcati, artieulis cylindricis 

 arete conjunctis. 



<$ . Tibite anticas extus denticulo obtuso vel obsoleto, apice lato et recte prolongato. Pygidium apice maxime 

 convexum et versus ventrem inflexum ; venter medio depressus, subcanaliculatus. 



$ . Tibias anticae distinctius bidentatae. Pygidium apice minus subtus inflexum, dorso late planato ; venter 

 convexus. 



By the form of the clypeus this genus is nearest allied to Cremastochilus, but the 

 disc of the mentum is not in the slightest degree cupuliform, and more nearly resembles 

 that of Genuehinus, and the form of the thorax is unlike that of any American genus 

 of the group. 



l. Lissomelas flohri. 



Omnino niger, sericeo-nitidus, elytris versus basin plus minusve velutinis ; capite, pygidio corporeque subtus 



subtilissime sparsim punctulatis ; thoraee, scuteHo elytrisque laevibus, his disco planato-subdepressis. 

 Long. 22-25 millim. <$ $ . 



Hab. Mexico, Ventanas in Durango (Hbge), Mexico city (Flohr). 



A good series of examples. In some the fine carina? of the triquetral tibiae are more 

 or less chipped or ragged by wear, and in one the front edge of the clypeus is similarly, 

 but symmetrically, broken on each side. 



