LACHNOSTEENA. 205 



castaneo-fusca, subtus cum pedibus antennisque rufo-fulva, nitida, ventre obscuriore ; clypeo valde trans- 

 verso, lateribus parallelis antice late rotundatis, margine antico leviter sinuato-reflexo, supra confluenter 

 punctato, fronte sparsius sed haud grossius punctata ; thorace ante medium dilatato, lateribus postice longe 

 parallelis, angulis posticis rectis, supra subtiliter disperse punctulato ; elytris coriaeeis, baud dense punctato- 

 rugosis, costis perspicuis. Labrum normale. 



2 . Pygidium dimidio basali convexo, apicali depresso parce punctato, rugulosum. Venter convexus, glaber, 

 impunctatus, segmento 5° lateribus punctulato-pilosis segmentoque 6° convexo punctato exceptis. Ungues 

 basi dentato-dilatati, dente inferiore infra medium (prope dilatationem) brevi, robusto, curvato. 



Long. 18 millim. 



Hah. Mexico, San Antonio de Arriba (Salle), Las Vigas (Hoge). 



Although I have seen one sex and two examples only of this species, its curious 

 relationship to L. scissa, and the facility with which it may be recognized, justify its 

 being described. 



48. Lachnosterna molopia. (Tab. XI. fig. 16, e .) 



Elongato-oblongo-ovata, glabra, nitida, castaneo-nigra, subtus cum pedibus antennisque fulvo-castanea, sat 

 disperse punctulata; clypeo minus transverso nee late rotundato, trapezoidali, angulis rotundatis, margine 

 antico leviter sinuato et reflexo, confluenter punctulato, fronte minus dense, discrete punctulata ; tborace 

 ante medium dilatato, postice lateribus parallelis subsinuatis, angulis posticis subacutis, supra discrete 

 punctato, interstitiis planis politis foveaque rotunda utrinque versus angulos posticos ; scutello punctulato, 

 spatio mediano lsevi. Labrum late arcuatim emarginatum. Antennae utroque sexu clava parva, S paullo 

 longiore, articulis 6° et 7° intus dilatatis. Venter segmentis 2°-5 m medio utrinque transverse callosis, callis 

 plus minusve elevatis. Ungues elongati, basi brevissime dentato-dilatati, dente inferiore parvo, acuto, 

 recte exstante, infra vel juxta medium sito. 



J . Pygidium convexum, glabrum, subconfluenter punctatum, fovea rotunda utrinque prope basin, margine 

 apicali breviter fimbriato. Venter medio glaber, lsevis, segmento 5° dimidio apicali depresso, 6° transverse 

 convexo, lsevi, apice lato transversim sulcato, punctato, margineque apicali medio sinuato. Calcaria postica 

 elongata, libera. 



cJ var. Segmentum ventrale 6 m transverse depressum, margine postico paullo elevato. 



$ . Pygidium juxta basin solum convexum, postice concavo-depressum, apice paullo reflexum, punctato-rugu- 

 losum, glabrum, basi sicut in tf bifoveatum. Venter sicut in S , differt solum segmento 6° magno, gibboso, 

 apice baud sulcato margineque apicali integro, basi lsevi, apice grosse punctato. 



Long. 17-18 millim. 



Hob. Mexico, Ciudad in Durango 8100 feet (Forrer, Edge). 



Very similar in form and colours and in important structural characters to 

 L. euryaspis ; the curious wheals on the ventral segment indicate an affinity also with 

 L. submetallica. The totally different form of clypeus in these three species seems to 

 show that this is a very variable feature. It resembles in form, colour, and other 

 characters the North- American L. fusca and its allies ; but differs from all the species 

 of the L. fusca group by the lower spur ( S ) being articulated, not connate. The male 

 variety (which is apparently much less common than what I take to be the typical form) 

 is so different that we seem here to have a case of dimorphism in this sex ; but when a 

 large series is examined intermediate states are seen to exist. In one male example 

 the apical ventral segment is nearly as gibbous as in the female, and it is only the 

 transverse depression at its apex and the longer antennal club which enable one to 

 decide that it is a male. 



