If you're using a Renewal Client, open data/lua files/datainfo/ and find npcidentity.lua and jobname.lua
Make new entries for each following the examples below:
npcidentity.lua
["JT_G_BANASPATY"] = 2157,
["JT_S_HORNET"] = 2158,
["JT_S_GIANT_HORNET"] = 2159,
["JT_S_LUCIOLA_VESPA"] = 2160,
["JT_I_HORN_SCARABA"] = 2161,
Make the number on the right the mob ID # in your database. Add in a unique name on the left "JT_MY_MOB_NAME" and use it in..
jobname.lua
[jobtbl.JT_G_BANASPATY] = "BANASPATY",
[jobtbl.JT_4_M_ALCHE_E] = "4_M_ALCHE_E",
[jobtbl.JT_S_HORNET] = "HORNET",
[jobtbl.JT_S_GIANT_HORNET] = "GIANT_HORNET",
[jobtbl.JT_S_LUCIOLA_VESPA] = "LUCIOLA_VESPA",
[jobtbl.JT_I_HORN_SCARABA] = "I_HORN_SCARABA",
On the right side is the name of the .spr file, left side is the same name used in the previous file.
Trial and error a bit, and if you're still stumped, post back, or likely someone will write a more in-depth guide than my own.