350 SEKEICOKNIA. 



differing from it in having the head and thorax much more coarsely punctured, the 

 thorax fully as long as broad (not. so long as broad in either sex of M. probus), and 

 the elytra more coarsely punctate-striate, with the interstices more convex. The third 

 joint of the antennse is very little longer than the second. 



21. Monocrepidius posticus. 



Elater posticus, Escbsch. Entomograph. i. p. 76 (1822) \ 



Monocrepidius posticus, Cand. Monogr. Elat. ii. p. 256 2 . 



Var. a. The prothorax with a median line, the anterior angles, and in some specimens the sides also, ferru- 

 ginous ; or ferrugineo-testaceous, with an indistinct divided discoidal patch. 



Var. fi. The prothorax with a median line, and the elytra with an oblong spot about the middle of the disc, 

 ferruginous. 



Var. y. The elytra each with an oval spot at the apex, and sometimes an oblong spot at the middle, ferruginous 



or testaceous. 

 Var. 2. The prothorax with a ferruginous median stripe; the elytra ferruginous, with a very large scutellar 

 patch and a common cruciform mark towards the apex, these markings sometimes connected at the sides 

 and suture, black. 



Hob. Mexico, Cordova (Edge), Yucatan (Pilate, in coll. Janson), Temax in North 

 Yucatan (Gaumer); Panama, Volcau de Chiriqui (Champion), Obispo (Salvin). — 

 Brazil 2 , Santa Catharina 1 ; Antilles, Grenada, St. Vincent. 



The numerous specimens before me from our region cannot be satisfactorily separated 

 from others from Brazil in the Janson collection determined as M. posticus by Candeze. 



The coloration of the upper surface, as in M. vespertinus, M. varians, &c, is very 

 variable. The variety a is from Yucatan and Chiriqui, some of the Chiriqui specimens 

 having the thorax in great part ferrugineo-testaceous ; the variety |3, represented by one 

 specimen, is from Cordova ; the variety y is from the islands of Grenada and St. Vincent, 

 and one of the Yucatan specimens shows traces of the apical elytral spot ; the variety I 

 is from Yucatan and Chiriqui. The scutellum, as in the Brazilian specimens, is more 

 or less ferruginous or rufous. In the Yucatan examples the interspaces between the 

 punctures on the thorax are very minutely reticulate and dull, but I cannot separate 

 them from the others from Panama, &c. The punctuation of the thorax is coarser and 

 less dense than in M. aversus, M. varians, M. bipustulatus, &c. The insect is allied to 

 M. piceus, Steinh., from Colombia, but it is more elongate and less depressed. Candeze 

 also gives 2 Buenos Ayres as a locality for M. posticus. 



22. Monocrepidius exclamationis. (Tab. XV. fig. 14, var.) 



Molus exclamationis, Cand. Monogr. Elat. ii. p. 303, t. 5. fig. 25 \ 

 Monocrepidius vespertinus, Steinh. Col. Hefte, xiv. p. 123 (nee Fabr.) 2 . 

 Monocrepidius incommodus, Fleut. Ann. Soc. Ent. Fr. 1891, p. 279 3 . 



Hob. Mexico, Cordova, Tapachula (Eoge), Teapa in Tabasco (Pilate, Eoge, E. H. 

 Smith) ; Bkitish Hondueas (coll. Janson) ; Guatemala, Teleman and San Geronimo in 



