Cleon
Legend
Zygraat
These reminded me of the Webbird from Expedition to the Barrier Peaks (and the original Monster Manual II). A closer looks shows that apart from both being "spider birds" and shooting silk from their abdomen they have very little in common.
Statwise, I'd use at least as much Eagle as Small Monstrous Spider.
SRD Eagle: Str 10, Dex 15, Con 12, Int 2, Wis 14, Cha 6, +1 NA
Small Spider: Str 7, Dex 17, Con 10, Int --http://www.d20srd.org/srd/specialAbilities.htm#intelligence, Wis 10, Cha 2, no NA
I'd rather give them an Eagle's Strength than average the two original beast's.
Str 10, Dex 16, Con 11, Int 4, Wis 12, Cha 4, +1 NA
The original creature has AC 3, equivalent to AC17 in 3E. That requires either a higher Dex or a higher NA to give it another 2 points of AC. I prefer a little from both columns. I'll also tweak the stats to give it three odd ones:
Zygraat: Str 10, Dex 18, Con 11, Int 4, Wis 13, Cha 5, +2 NA
For the feat, I'd give them Flyby Attack (almost as dull, I know) plus Weapon Finesse as a bonus.