May iSgg.] 



SUPPLEMENT TO PSYCHE. 



the putrescent mass, Init tlie skin iif 

 tlie cactus toughens in clr)'in<; and 

 has to be cut apart with an axe, anil 

 ol' course in such violent handling all 

 the fine things are lost. I have secured 

 some of these small species in one or 

 two specimens ; one of these is an 

 Holoparamecus (//. pacijicus Lee). 

 Of the two species of Trichopteryx 

 mentioned before I have a fair series. 

 Vesterda}', there turned up in consider- 

 able numbers a small, shining brown 

 Cryptophagid {^Ephistemus cactofhiliis 

 Sz. n. sp.), very similar to that we 

 found at Crescent Cit^' under decaying 

 weeds. The minute new Oligota with 

 red elytra was also very abundant. 

 There is further a great Staphylinid, a 

 most beautiful fellow, with the body 

 blue black except the two last segments 

 which are bright orange {Xantkopyg-iis 

 cacti Horn) . It is as wild as Listotro- 

 phiis cingulatus. I have found it twice 

 and got three or four specimens each 

 lime. 



My most interesting discovery in the 

 giant cactus is contained in some 

 pieces of cactus pulp which I mail with 

 this, nearly dry and quite hard. These 

 came from a cavity in a giant cactus 

 which had been e.xcavated by birds. 

 In these hardened crusts which were 

 hanging in the cavity like bits of dry 

 meat, there breeds a most marvellous 

 Scolytid beetle of a genus quite 

 unknown to me, with a long liorn on 

 the head of the male. This horn is 

 double but united until near the 

 extremity where it is parted and the 

 tips are oddly pointed ( Cqcfopituts 



n. g., Jnihliardi Schwarz n. sp.) I 

 notice that in the mature specimens 

 the horn projects forward but all imma- 

 ture males have the horn curved back 

 over the thorax. I have taken about 

 300 specimens, also larvae, but it took 

 an entire day to get them out. I never 

 saw them before, although I have 

 examined crusts from many holes. 



The fact is there must be a certain 

 amount of moisture in the crusts ; if the 

 pieces are stone hard as they usually 

 are these Scolytids cannot excavate. 

 A cavity in this condition does not 

 occur very often, and I do not feel sure 

 that I shall ever find the like again. It 

 is foi' this reason that I took a good 

 supply of this Rhinoceros Scolytid of 

 the Giant Cactus. In these or similar 

 crusts I find occasionally the small 

 Calandrid Apotrepzis densicollis, diffi- 

 cult to see in the d(5bris by reason of its 

 dark color atul rough sculptiu'e. I 

 have the larvae of that also. There is 

 finally a small red, hairy Clerid larva 

 penetrating these crusts and feeding 

 upon the larvae of the Scolytid but I 

 have not yet found the imago. 



I find also that the flat Opuntias 

 (O. eiigelmanni) on the hills near the 

 giant cacti sometimes have rotten 

 hearts in the main stem filled with the 

 large Volucella larvae, Belontichus 

 ephippiatus and the Aleocharinae of 

 the giant cactus. I even found Holo- 

 Icpta yucateca in one such stem, and 

 perhaps the larger part of this fauna 

 may be found in such places. 



Tucson, Ar., Jan. 15, 1897. 



Yesterday the siin came out between 



