250 OETHOPTEEA. 



segments, dark piceous, while the hind tibiae are infuscated internally and vinaceous externally and the 

 tarn are coral-red. The structure of the vertex is somewhat similar to that of JR. humilis, Rehn, and 

 rather free from punctation. The antennae are slender, brownish, terminating in a pale testaceous tip, 

 which includes four or five joints. 



The insect has a rather prominent border to the hind margin of each eye, as well as the external lunule and 

 the entire inner side of the apex of the hind femora, black. Prosternal spine narrow, but its apex 

 provided with the usual raised transverse carina. Last ventral segment of tf abdomen elongate prow- 

 shaped, the apex gently rounded. 



•Length of body, c? , 32 ; of pronotum 4-25, of hind femora 15 millim. 



Hal. Mexico, Vera Cruz (Bev. T. Ileyde, in coll. L. Bruner). 



5. Ehicnoderma humilis, Rehn. 



Rhicnoderma humile, Rehn, Proc. Acad. Nat. Sci. Philad. 1905, pp. 415-417 K 

 Hal. Costa Rica, Tarbaca 1 . 



DIC^ARCHUS, Stal 



Diceearchus, Stal, Bihang till K. Svensk. Vet.-Akad. Handl. v. no. 4, pp. 44, 89 (1878) ; Syst. 

 Acrid, i. pp. 44, 89 (1878). 



According to Stal (loc. tit. p. 90), the insect which is the type of the genus 

 Diccearchus bears a general resemblance to Agesander ruficornis. 



l. Dicsearchus cribellatus, Stal. 



Diccearchus cribellatus, Stal, Bihang till K. Svensk. Vet.-Akad. Handl. v. no. 4, pp. 89, 90 (1878) '; 

 Syst. Acrid, i. pp. 89, 90 (1878) \ 



Hob. Colombia 12 . 



While no records or specimens are at hand to indicate that this locust occurs within 

 territory under investigation, there can be scarcely any doubt but that it belongs to 

 the Central-American fauna. 



BACTROPHORA, Westwood. 



Bactrophora, Westwood, Arcana Ent. i. p. 66 (1845). 

 Scolodephalus, Bruner, Insect Life, xvi. p. 314 (1905). 



The insect upon which the present genus is based was from an unknown locality, 

 and was figured on the same plate with a Sierra Leone plant. Its actual occurrence 

 in Costa Rica, however, will now definitely establish its habitat. The structure is so 

 abnormal that the exact location of the genus is a little doubtful. The only species 

 appears to be the one described by Westwood and again by the present writer. 



l. Bactrophora dominans, Westwood. 



Bactrophora dominans, Westw. Arcana Ent. i. p. 66, t. 17. fig. 2 ( ? ) (1845) \ 

 Scolocephalus mirabilis, Bruner, Ins. Life, xvi. pp. 814, 315, t. 11 (<$') (1905) \ 



Hab. Costa Rica, Pozo Azul (Underwood, in coll. L. Bruner: 6 ). 



