124 GEO. H. HORN, M. D. 



Having the sub-families arranged it will be observed that the Eucne- 

 niinse and Cerophytinse have no visible trochantin to the middle coxae. 

 The Elaterinse and Cebrioninae have a well defined trochantin which 

 is very small in the Perothopinse. 



In the first sub-family the mandibles are short, usually robust, 

 their apices broad or bidentate. The vast majority of the species 

 of the second sub-family have a similar type of mandible ; in the 

 final tribe (Plastocerini), the mandibles become prominent and acute 

 at tip and in great part smooth, a modification which is exaggerated 

 in the Cebrioninae to become gradually reduced in the Perothopinse 

 and Cerophytinse. 



In their relationship with each other the first three sub-families form 

 a very natural linear series. The fourth with Eucnemide affinity seems 

 equally related to the Cebrionides. The Cerophytinse seem to me to 

 have less Eucnemide affinity than de Bonvouloir claims, but with some 

 relationship with that series, and almost equally with the Perothopinse, 

 they lead very naturally to the Rhipiceridse and Dascyllidse. 



CRYPTOSTOJHA Latr. 

 The figure on the accompanying plate VI, fig. 13, will give an idea 

 of the form and color of Cryptostoma Dohmi Horn. The color is bright 

 blood-red the shaded part of the elytra black. I have seen but one 

 specimen kindly given me by Dr. Dohrn who obtained it from a series 

 of specimens collected near San Diego, California. 



MVRMECOSPECTR4 Motsch. 



Head oval, broadest between the eyes and arcuately narrowed behind them. 

 Antennae arising under a slight frontal ridge and more distant from the eyes than 

 from the front, apparently ten-jointed. Labrum transverse, feebly emarginate, 

 concealing the mandibles. Maxillary palpi with the second and last joints equal 

 in length, the third very short and transverse the terminal flat, oval and obliquely 

 truncate. Labial palpi short, the terminal joint cylindrical, acute at tip, more 

 slender than the preceding but equal in length. Thorax ovate, convex, the base 

 prolonged, basal margin retiexed, hind angles feebly prominent, anterior angles 

 with large extensible vesicles. Scutellum moderate, rounded at tip. Elytra oval, 

 rounded at tip, humeri obtusely prominent, disc very convex posteriorly, behind 

 the base transversely impressed. A large extensible vesicle behind the humeri. 

 Body apterous. Abdomen conically prolonged beyond the elytra. Legs slender. 

 Tarsi five-jointed in both sexes. Claws with membranous appendages. 



AstrnNjB % . — First joint elongate pyriform, slightly arcuate, second very small 

 almost concealed, third large, quadrate, a little broader than long, distal edge 

 emarginate, joints 3—10 subequal, eleventh slightly longer. 



Antknn.k 9- — First joint large, triangularly dilated, second narrower and one- 

 half shorter, third a half shorter than the second and the smallest of all, 4 — 7 

 longer than the third, 8 — 11 a little longer and broader. 



