LISTEOCHELUS. 173 



medio elevato efc late triangulariter dilatato. Calcaria postica libera, inferiore spatulato superiore multo 

 longiore et gracilior. Antennarum clava valde elongata, cseteris articulis conjunctis multo longior ; articulis 

 4°-7 m intus paullo productis, acutis. 

 Long. 21 millim. 



Hab. Mexico, Juquila {Salle). 

 Two males only, exactly similar. 



9. Listrochelus scoparius. 



Listrochelus scoparius, Lee. Journ. Acad. Phil. ser. 2, iii. p. 264 l ; Horn, Trans. Am. Ent. Soe. vii. 

 p. 142 2 . 



Hab. North America, Arizona 2 . — Mexico, Sonora 1 . 



10. Listrochelus mucoreus. 



Listrochelus mucoreus, Lee. Jonrn. Acad. Phil. ser. 2, iii. p. 263 ' ; Horn, Trans. Am. Ent. Soe. vii. 

 p. 144 \ 

 Bab. North America, California 1 , Texas, Arizona &c. 2 . — Mexico, Northern Sonora 

 (Morrison). 



One female example from the late Mr. Morrison, bearing the name of this species, 

 which agrees moderately well with Dr. Horn's description. 



11. Listrochelus — -? 



Hab. Mexico, Cholula in Puebla {Edge). 



A single female example, apparently of a species different from any of the foregoing. 



12. Listrochelus oblongulus. (Tab. X. fig. 7, a .) 



Parvus, elongato-oblongus, nitidus, niger vel (immaturus ?) castaueus, subtus cum fenioribus testaceo-rufus ; 

 clypeo elongato semiovato vel obtuse quadrato concavo, margiuibus alte elevatis, integris, fronte planato- 

 declivi, occipite baud elevato, polito ; toto capite dense punctato, glabro ; tborace sat elongato, medio dilatato, 

 margine laterali erenato, angulis anticis rectis, posticis obtusis, supra discrete punctato, spatio dorsali laevi : 

 elytris sat disperse punctulatis, subrugulosis, costis lsevibus. Pygidium sat elongatum, parum convexum, 

 disperse grosse punctatum, parce setosum. Cosarum posticarum angulum exterior baud productum. 

 Antennae 9-articulat33. 



cJ . Venter fere losvis, segmento 6° medio transverse planato. Ungues omnes edentati minute denticulati. 



§ . Venter fere loavis, segmento 6° convexo. Ungues omnes dente parvo acuto ante medium, post dentem 

 latiores et subtiliter denticulati. 



Long. 8-10 millim. 



Hab. Mexico, Iguala in Guerrero, Chilpancingo (Edge). A good series of examples. 



This small and narrow insect has not at all the appearance of a ' Rhizotrogide ' In 

 general form it resembles much more the species of Hadrocerus (' sensu ' Burmeister) 

 of the Clavipal/pus group. The labrum is narrowly and deeply excavated, the apical 

 joint of the maxillary palpi slender, and the mandibles concealed. 



